| Abelmoschus esculentus (L.) Moench | 1510 images |
| Abies balsamea (L.) Mill. | 1048 images |
| Abronia fragrans Nutt. ex Hook. | 80 images |
| Abutilon theophrasti Medik. | 3382 images |
| Acaciella angustissima (Mill.) Britton & Rose | 83 images |
| Acalypha rhomboidea Raf. | 3 images |
| Acalypha virginica L. | 1290 images |
| Acer campestre L. | 21940 images |
| Acer glabrum Torr. | 166 images |
| Acer grandidentatum Nutt. | 74 images |
| Acer negundo L. | 18321 images |
| Acer palmatum Thunb. | 13023 images |
| Acer pensylvanicum L. | 899 images |
| Acer platanoides L. | 18241 images |
| Acer pseudoplatanus L. | 25394 images |
| Acer rubrum L. | 6723 images |
| Acer saccharinum L. | 8504 images |
| Acer saccharum Marshall | 2723 images |
| Acer spicatum Lam. | 494 images |
| Acer tataricum L. | 3538 images |
| Achillea alpina L. | 23 images |
| Achillea millefolium L. | 26254 images |
| Achillea nobilis L. | 12221 images |
| Achillea ptarmica L. | 3989 images |
| Achyranthes bidentata Blume | 36 images |
| Acmella repens (Walter) Rich. | 1 images |
| Acmispon americanus (Nutt.) Rydb. | 29 images |
| Aconitum columbianum Nutt. | 175 images |
| Aconitum uncinatum L. | 10 images |
| Acorus calamus L. | 784 images |
| Actaea cordifolia DC. | 1 images |
| Actaea pachypoda Elliott | 932 images |
| Actaea racemosa L. | 765 images |
| Actaea rubra (Aiton) Willd. | 801 images |
| Adenocaulon bicolor Hook. | 165 images |
| Adiantum capillus-veneris L. | 3422 images |
| Adiantum pedatum L. | 659 images |
| Adlumia fungosa (Aiton) Britton, Sterns & Poggenb. | 8 images |
| Adonis annua L. | 890 images |
| Adoxa moschatellina L. | 800 images |
| Aegilops cylindrica Host | 63 images |
| Aegopodium podagraria L. | 13200 images |
| Aesculus × bushii C.K.Schneid. | 15 images |
| Aesculus flava Sol. | 288 images |
| Aesculus glabra Willd. | 1152 images |
| Aesculus hippocastanum L. | 18728 images |
| Aesculus pavia L. | 1667 images |
| Aethusa cynapium L. | 2287 images |
| Agalinis aspera (Douglas ex Benth.) Britton | 1 images |
| Agalinis purpurea (L.) Pennell | 213 images |
| Agalinis skinneriana (Alph.Wood ex A.Gray) Britton | 8 images |
| Agalinis tenuifolia (Vahl) Raf. | 109 images |
| Agastache foeniculum (Pursh) Kuntze | 2461 images |
| Agastache nepetoides (L.) Kuntze | 80 images |
| Agastache scrophulariifolia (Willd.) Kuntze | 21 images |
| Agave virginica L. | 55 images |
| Ageratina altissima (L.) R.M.King & H.Rob. | 1537 images |
| Ageratum conyzoides L. | 685 images |
| Agoseris aurantiaca (Hook.) Greene | 47 images |
| Agoseris glauca (Pursh) Raf. | 36 images |
| Agrimonia eupatoria L. | 12864 images |
| Agrimonia gryposepala Wallr. | 435 images |
| Agrimonia pubescens Wallr. | 25 images |
| Agrimonia rostellata Wallr. | 31 images |
| Agrimonia striata Michx. | 20 images |
| Agropyron cristatum (L.) Gaertn. | 137 images |
| Agropyron desertorum (Fisch. ex Link) Schult. | 3 images |
| Agrostemma githago L. | 4435 images |
| Agrostis canina L. | 62 images |
| Agrostis capillaris L. | 2137 images |
| Agrostis exarata Trin. | 11 images |
| Agrostis gigantea Roth | 190 images |
| Agrostis hyemalis (Walter) Britton, Sterns & Poggenb. | 4 images |
| Agrostis perennans (Walter) Tuck. | 4 images |
| Agrostis scabra Willd. | 2 images |
| Agrostis stolonifera L. | 424 images |
| Ailanthus altissima (Mill.) Swingle | 13992 images |
| Ajuga genevensis L. | 4624 images |
| Ajuga reptans L. | 22764 images |
| Albizia julibrissin Durazz. | 15194 images |
| Alcea rosea L. | 15792 images |
| Alcea rugosa Alef. | 7 images |
| Alchemilla australis (Rydb.) Bomble | 59 images |
| Alchemilla monticola Opiz | 912 images |
| Aletris aurea Walter | 3 images |
| Aletris farinosa L. | 19 images |
| Aliciella pinnatifida (Nutt. ex A.Gray) J.M.Porter | 1 images |
| Alisma gramineum Lej. | 27 images |
| Alisma subcordatum Raf. | 37 images |
| Alisma triviale Pursh | 38 images |
| Alkekengi officinarum Moench | 5049 images |
| Alliaria petiolata (M.Bieb.) Cavara & Grande | 32203 images |
| Allionia incarnata L. | 154 images |
| Allium ampeloprasum L. | 6713 images |
| Allium atroviolaceum Boiss. | 240 images |
| Allium canadense L. | 340 images |
| Allium cepa L. | 2630 images |
| Allium cernuum Roth | 270 images |
| Allium drummondii Regel | 55 images |
| Allium fistulosum L. | 701 images |
| Allium geyeri S.Watson | 3 images |
| Allium sativum L. | 1390 images |
| Allium schoenoprasum L. | 4922 images |
| Allium stellatum Nutt. ex Ker Gawl. | 22 images |
| Allium tricoccum Aiton | 419 images |
| Allium tuberosum Rottler ex Spreng. | 1509 images |
| Allium vineale L. | 3615 images |
| Alnus alnobetula (Ehrh.) K.Koch | 2001 images |
| Alnus glutinosa (L.) Gaertn. | 17588 images |
| Alnus incana (L.) Moench | 3234 images |
| Alnus maritima (Marshall) Muhl. ex Nutt. | 4 images |
| Alnus serrulata (Aiton) Willd. | 151 images |
| Alopecurus aequalis Sobol. | 140 images |
| Alopecurus arundinaceus Poir. | 37 images |
| Alopecurus carolinianus Walter | 4 images |
| Alopecurus geniculatus L. | 136 images |
| Alopecurus myosuroides Huds. | 584 images |
| Alopecurus pratensis L. | 3008 images |
| Alternanthera caracasana Kunth | 143 images |
| Alternanthera paronychioides A.St.-Hil. | 59 images |
| Alternanthera philoxeroides (Mart.) Griseb. | 368 images |
| Althaea armeniaca Ten. | 6 images |
| Althaea officinalis L. | 3875 images |
| Alyssum alyssoides (L.) L. | 1165 images |
| Alyssum desertorum Stapf | 29 images |
| Alyssum simplex Rudolphi | 182 images |
| Amaranthus albus L. | 598 images |
| Amaranthus blitoides S.Watson | 587 images |
| Amaranthus blitum L. | 2571 images |
| Amaranthus californicus (Moq.) S.Watson | 12 images |
| Amaranthus caudatus L. | 4007 images |
| Amaranthus cruentus L. | 1345 images |
| Amaranthus hybridus L. | 1726 images |
| Amaranthus hypochondriacus L. | 1492 images |
| Amaranthus palmeri S.Watson | 133 images |
| Amaranthus powellii S.Watson | 141 images |
| Amaranthus retroflexus L. | 9502 images |
| Amaranthus spinosus L. | 1534 images |
| Ambrosia acanthicarpa Hook. | 69 images |
| Ambrosia artemisiifolia L. | 5783 images |
| Ambrosia bidentata Michx. | 20 images |
| Ambrosia confertiflora DC. | 27 images |
| Ambrosia psilostachya DC. | 439 images |
| Ambrosia trifida L. | 1178 images |
| Amelanchier alnifolia (Nutt.) Nutt. ex M.Roem. | 848 images |
| Amelanchier arborea (F.Michx.) Fernald | 37 images |
| Amelanchier bartramiana (Tausch) M.Roem. | 4 images |
| Amelanchier canadensis (L.) Medik. | 2833 images |
| Amelanchier interior E.L.Nielsen | 2 images |
| Amelanchier laevis Wiegand | 205 images |
| Amelanchier stolonifera Wiegand | 9 images |
| Amianthium muscitoxicum (Walter) A.Gray | 26 images |
| Ammannia auriculata Willd. | 14 images |
| Ammannia coccinea Rottb. | 54 images |
| Ammannia robusta Heer & Regel | 7 images |
| Ammi majus L. | 2573 images |
| Amorpha canescens Pursh | 254 images |
| Amorpha fruticosa L. | 2294 images |
| Amorpha nana Nutt. | 4 images |
| Amorpha ouachitensis Wilbur | 8 images |
| Ampelopsis cordata Michx. | 484 images |
| Ampelopsis glandulosa (Wall.) Momiy. | 152 images |
| Amphiachyris dracunculoides (DC.) Nutt. | 108 images |
| Amphicarpaea bracteata (L.) Fernald | 497 images |
| Amsinckia lycopsoides Lindl. ex Lehm. | 1 images |
| Amsinckia menziesii (Lehm.) A.Nelson & J.F.Macbr. | 234 images |
| Amsinckia spectabilis Fisch. & C.A.Mey. | 1 images |
| Amsinckia tessellata A.Gray | 1 images |
| Amsonia ciliata Walter | 102 images |
| Amsonia hubrichtii Woodson | 281 images |
| Amsonia tabernaemontana Walter | 898 images |
| Anaphalis margaritacea (L.) Benth. & Hook.f. | 1559 images |
| Anchusa arvensis (L.) M.Bieb. | 2903 images |
| Anchusa azurea Mill. | 3355 images |
| Anchusa officinalis L. | 5439 images |
| Andersonglossum virginianum (L.) J.I.Cohen | 265 images |
| Andromeda polifolia L. | 685 images |
| Andropogon gerardi Vitman | 234 images |
| Andropogon glomeratus (Walter) Britton, Sterns & Poggenb. | 7 images |
| Andropogon gyrans Ashe | 10 images |
| Andropogon hallii Hack. | 3 images |
| Andropogon ternarius Michx. | 33 images |
| Andropogon virginicus L. | 3 images |
| Androsace occidentalis Pursh | 5 images |
| Androsace septentrionalis L. | 185 images |
| Androstephium coeruleum (Scheele) Greene | 5 images |
| Anemonastrum canadense (L.) Mosyakin | 1052 images |
| Anemone berlandieri Pritz. | 154 images |
| Anemone caroliniana Walter | 9 images |
| Anemone cylindrica A.Gray | 15 images |
| Anemone multifida Poir. | 134 images |
| Anemone virginiana L. | 407 images |
| Anemonella thalictroides (L.) Spach | 404 images |
| Anemonoides quinquefolia (L.) Holub | 1344 images |
| Anemopsis californica (Nutt.) Hook. & Arn. | 129 images |
| Anethum graveolens L. | 2949 images |
| Angelica atropurpurea L. | 424 images |
| Anoda cristata (L.) Schltdl. | 66 images |
| Antennaria howellii Greene | 23 images |
| Antennaria microphylla Rydb. | 6 images |
| Antennaria neglecta Greene | 203 images |
| Antennaria parlinii Fernald | 24 images |
| Antennaria parvifolia Nutt. | 99 images |
| Antennaria plantaginifolia (L.) Hook. | 214 images |
| Antennaria rosea Greene | 6 images |
| Anthemis arvensis L. | 4354 images |
| Anthemis cotula L. | 1769 images |
| Anthoxanthum aristatum Boiss. | 59 images |
| Anthoxanthum nitens (Weber) Y.Schouten & Veldkamp | 81 images |
| Anthoxanthum odoratum L. | 2508 images |
| Anthriscus caucalis M.Bieb. | 1857 images |
| Anthriscus cerefolium (L.) Hoffm. | 3548 images |
| Anthriscus sylvestris (L.) Hoffm. | 20257 images |
| Anthyllis vulneraria L. | 9678 images |
| Anticlea elegans (Pursh) Rydb. | 67 images |
| Antirrhinum majus L. | 15826 images |
| Apera interrupta (L.) P.Beauv. | 32 images |
| Apera spica-venti (L.) P.Beauv. | 114 images |
| Aphanostephus pilosus Buckley | 4 images |
| Aphanostephus ramosissimus DC. | 47 images |
| Apios americana Medik. | 353 images |
| Apium graveolens L. | 2078 images |
| Aplectrum hyemale (Muhl. ex Willd.) Torr. | 32 images |
| Apocynum androsaemifolium L. | 1128 images |
| Apocynum cannabinum L. | 1119 images |
| Aquarius cordifolius (L.) Christenh. & Byng | 95 images |
| Aquilegia brevistyla Hook. | 1 images |
| Aquilegia canadensis L. | 2136 images |
| Aquilegia vulgaris L. | 21141 images |
| Arabidopsis lyrata (L.) O'Kane & Al-Shehbaz | 2 images |
| Arabidopsis thaliana (L.) Heynh. | 2206 images |
| Arabis caucasica Willd. | 779 images |
| Arabis hirsuta (L.) Scop. | 1586 images |
| Arachis hypogaea L. | 974 images |
| Aralia chinensis L. | 19 images |
| Aralia elata (Miq.) Seem. | 921 images |
| Aralia hispida Vent. | 100 images |
| Aralia nudicaulis L. | 939 images |
| Aralia racemosa L. | 320 images |
| Aralia spinosa L. | 477 images |
| Arctium lappa L. | 11247 images |
| Arctium minus (Hill) Bernh. | 12679 images |
| Arctium tomentosum Mill. | 2418 images |
| Arctostaphylos uva-ursi (L.) Spreng. | 2312 images |
| Arenaria benthamii Fenzl ex Torr. & A.Gray | 1 images |
| Arenaria serpyllifolia L. | 1574 images |
| Arethusa bulbosa L. | 42 images |
| Argemone albiflora Hornem. | 254 images |
| Argemone mexicana L. | 1253 images |
| Argemone polyanthemos (Fedde) Ownbey | 19 images |
| Argemone squarrosa Greene | 7 images |
| Argentina anserina (L.) Rydb. | 5672 images |
| Arisaema dracontium (L.) Schott | 369 images |
| Arisaema triphyllum (L.) Schott | 2255 images |
| Aristida adscensionis L. | 163 images |
| Aristida purpurea Nutt. | 12 images |
| Aristolochia serpentaria L. | 19 images |
| Aristolochia tomentosa Sims | 92 images |
| Armoracia rusticana G.Gaertn., B.Mey. & Scherb. | 297 images |
| Arnica cordifolia Hook. | 227 images |
| Arnica fulgens Pursh | 7 images |
| Arnica lonchophylla Greene | 7 images |
| Arnoglossum atriplicifolium (L.) H.Rob. | 96 images |
| Arnoglossum plantagineum Raf. | 54 images |
| Aronia × prunifolia (Marshall) Rehder | 11 images |
| Aronia arbutifolia (L.) Pers. | 213 images |
| Aronia melanocarpa (Michx.) Elliott | 3493 images |
| Arrhenatherum elatius (L.) P.Beauv. ex J.Presl & C.Presl | 2487 images |
| Artemisia abrotanum L. | 1593 images |
| Artemisia absinthium L. | 5572 images |
| Artemisia annua L. | 3897 images |
| Artemisia biennis Willd. | 171 images |
| Artemisia campestris L. | 1980 images |
| Artemisia cana Pursh | 36 images |
| Artemisia dracunculus L. | 2655 images |
| Artemisia filifolia Torr. | 44 images |
| Artemisia frigida Willd. | 145 images |
| Artemisia ludoviciana Nutt. | 1332 images |
| Artemisia pontica L. | 97 images |
| Artemisia stelleriana Besser | 232 images |
| Artemisia tridentata Nutt. | 367 images |
| Artemisia vulgaris L. | 19029 images |
| Arthraxon hispidus (Thunb.) Makino | 52 images |
| Arum italicum Mill. | 18644 images |
| Aruncus dioicus (Walter) Fernald | 5316 images |
| Arundinaria gigantea (Walter) Muhl. | 213 images |
| Arundo donax L. | 3413 images |
| Asarum canadense L. | 670 images |
| Asclepias amplexicaulis Sm. | 60 images |
| Asclepias arenaria Torr. | 17 images |
| Asclepias asperula (Decne.) Woodson | 461 images |
| Asclepias engelmanniana Woodson | 8 images |
| Asclepias exaltata L. | 114 images |
| Asclepias hirtella (Pennell) Woodson | 18 images |
| Asclepias incarnata L. | 1343 images |
| Asclepias involucrata Engelm. ex Torr. | 2 images |
| Asclepias lanuginosa Nutt. | 5 images |
| Asclepias latifolia (Torr.) Raf. | 133 images |
| Asclepias macrotis Torr. | 5 images |
| Asclepias meadii Torr. ex A.Gray | 3 images |
| Asclepias obovata Elliott | 2 images |
| Asclepias ovalifolia Decne. | 8 images |
| Asclepias perennis Walter | 44 images |
| Asclepias pumila (A.Gray) Vail | 6 images |
| Asclepias purpurascens L. | 690 images |
| Asclepias quadrifolia Jacq. | 96 images |
| Asclepias speciosa Torr. | 777 images |
| Asclepias stenophylla A.Gray | 20 images |
| Asclepias subverticillata (A.Gray) Vail | 20 images |
| Asclepias sullivantii Engelm. ex A.Gray | 328 images |
| Asclepias syriaca L. | 4344 images |
| Asclepias tuberosa L. | 2671 images |
| Asclepias uncialis Greene | 2 images |
| Asclepias variegata L. | 148 images |
| Asclepias verticillata L. | 207 images |
| Asclepias viridiflora Raf. | 215 images |
| Asclepias viridis Walter | 536 images |
| Asimina triloba (L.) Dunal | 1624 images |
| Asparagus officinalis L. | 3537 images |
| Asperugo procumbens L. | 472 images |
| Asplenium × alternifolium Wulfen | 4 images |
| Asplenium bradleyi D.C.Eaton | 1 images |
| Asplenium montanum Willd. | 23 images |
| Asplenium pinnatifidum Nutt. | 3 images |
| Asplenium platyneuron (L.) Britton, Sterns & Poggenb. | 375 images |
| Asplenium resiliens Kunze | 11 images |
| Asplenium rhizophyllum L. | 76 images |
| Asplenium ruta-muraria L. | 2229 images |
| Asplenium septentrionale (L.) Hoffm. | 447 images |
| Asplenium trichomanes L. | 6681 images |
| Asplenium viride Huds. | 623 images |
| Aster tataricus L.f. | 67 images |
| Astragalus alpinus L. | 435 images |
| Astragalus canadensis L. | 52 images |
| Astragalus cicer L. | 437 images |
| Astragalus crassicarpus Nutt. | 73 images |
| Astragalus lindheimeri Engelm. ex A.Gray | 1 images |
| Astragalus lotiflorus Hook. | 8 images |
| Astragalus missouriensis Nutt. | 43 images |
| Astragalus mollissimus Torr. | 65 images |
| Astragalus nuttallianus DC. | 19 images |
| Astragalus purshii Douglas ex G.Don | 13 images |
| Astragalus racemosus Pursh | 25 images |
| Astragalus tenellus Pursh | 5 images |
| Athyrium filix-femina (L.) Roth | 4268 images |
| Atocion armeria (L.) Raf. | 3116 images |
| Atriplex argentea Nutt. | 3 images |
| Atriplex canescens (Pursh) Nutt. | 203 images |
| Atriplex glabriuscula Edmondston | 98 images |
| Atriplex hortensis L. | 1180 images |
| Atriplex littoralis L. | 391 images |
| Atriplex micrantha Ledeb. | 73 images |
| Atriplex oblongifolia Waldst. & Kit. | 28 images |
| Atriplex patula L. | 884 images |
| Atriplex prostrata Boucher ex DC. | 1610 images |
| Atriplex rosea L. | 50 images |
| Atriplex tatarica L. | 158 images |
| Atropa bella-donna L. | 4660 images |
| Aureolaria flava (L.) Farw. | 59 images |
| Aureolaria grandiflora (Benth.) Pennell | 53 images |
| Aureolaria pectinata (Nutt.) Pennell | 41 images |
| Avena fatua L. | 2881 images |
| Avena sativa L. | 3928 images |
| Avenella flexuosa (L.) Drejer | 543 images |
| Avenula pubescens (Huds.) Dumort. | 133 images |
| Axonopus fissifolius (Raddi) Kuhlm. | 352 images |
| Axonopus furcatus (Flüggé) Hitchc. | 1 images |
| Azolla caroliniana Willd. | 18 images |
| Azolla filiculoides Lam. | 358 images |
| Baccharis halimifolia L. | 1875 images |
| Baccharis salicina Torr. & A.Gray | 26 images |
| Bacopa monnieri (L.) Wettst. | 229 images |
| Bacopa rotundifolia (Michx.) Wettst. | 7 images |
| Ballota nigra L. | 5913 images |
| Baptisia × bicolor Greenm. & Larisey | 12 images |
| Baptisia alba (L.) R.Br. | 149 images |
| Baptisia australis (L.) R.Br. | 1335 images |
| Baptisia nuttalliana Small | 49 images |
| Baptisia sphaerocarpa Nutt. | 197 images |
| Baptisia tinctoria (L.) R.Br. | 57 images |
| Barbarea orthoceras Ledeb. | 572 images |
| Barbarea stricta Andrz. ex Besser | 80 images |
| Barbarea verna (Mill.) Asch. | 1618 images |
| Barbarea vulgaris W.T.Aiton | 1297 images |
| Bassia hyssopifolia (Pall.) Kuntze | 45 images |
| Bassia scoparia (L.) A.J.Scott | 548 images |
| Beckmannia syzigachne (Steud.) Fernald | 18 images |
| Bellis perennis L. | 14914 images |
| Berberis canadensis Mill. | 14 images |
| Berberis repens Lindl. | 1905 images |
| Berberis thunbergii DC. | 9638 images |
| Berberis vulgaris L. | 5885 images |
| Berchemia scandens (Hill) K.Koch | 5 images |
| Berlandiera lyrata Benth. | 81 images |
| Berteroa incana (L.) DC. | 5565 images |
| Berula erecta (Huds.) Coville | 869 images |
| Betula alleghaniensis Britton | 307 images |
| Betula cordifolia Regel | 7 images |
| Betula glandulosa Michx. | 10 images |
| Betula nigra L. | 968 images |
| Betula occidentalis Hook. | 45 images |
| Betula papyrifera Marshall | 581 images |
| Betula pendula Roth | 12239 images |
| Betula populifolia Marshall | 78 images |
| Betula pumila L. | 11 images |
| Bidens alba (L.) DC. | 320 images |
| Bidens aristosa (Michx.) Britton | 201 images |
| Bidens bipinnata L. | 1376 images |
| Bidens cernua L. | 589 images |
| Bidens connata Muhl. ex Willd. | 68 images |
| Bidens frondosa L. | 3535 images |
| Bidens pilosa L. | 3203 images |
| Bidens tripartita L. | 1309 images |
| Bidens vulgata Greene | 81 images |
| Bignonia capreolata L. | 606 images |
| Bistorta vivipara (L.) Delarbre | 1466 images |
| Blephilia ciliata (L.) Raf. ex Benth. | 82 images |
| Blephilia hirsuta (Pursh) Benth. | 91 images |
| Bletia spicata (Walter) Sosa & M.W.Chase | 18 images |
| Blitum bonus-henricus (L.) Rchb. | 1666 images |
| Blitum capitatum L. | 236 images |
| Blitum virgatum L. | 139 images |
| Boechera drummondii (A.Gray) Á.Löve & D.Löve | 3 images |
| Boehmeria cylindrica (L.) Sw. | 676 images |
| Boerhavia erecta L. | 202 images |
| Bolboschoenus fluviatilis (Torr.) Soják | 3 images |
| Bolboschoenus maritimus (L.) Palla | 886 images |
| Boltonia asteroides L'Hér. | 5 images |
| Borago officinalis L. | 21042 images |
| Borodinia laevigata (Muhl. ex Willd.) P.J.Alexander & Windham | 4 images |
| Bothriochloa barbinodis (Lag.) Herter | 537 images |
| Bothriochloa bladhii (Retz.) S.T.Blake | 278 images |
| Bothriochloa ischaemum (L.) Keng | 638 images |
| Bothriochloa laguroides (DC.) Herter | 22 images |
| Botrychium dissectum Spreng. | 170 images |
| Botrychium lunaria (L.) Sw. | 592 images |
| Botrychium multifidum (S.G.Gmel.) Rupr. | 2 images |
| Botrychium simplex E.Hitchc. | 49 images |
| Botrychium virginianum (L.) Sw. | 231 images |
| Bouteloua barbata Lag. | 1 images |
| Bouteloua curtipendula (Michx.) Torr. | 124 images |
| Bouteloua dactyloides (Nutt.) Columbus | 2 images |
| Bouteloua gracilis (Kunth) Lag. ex Griffiths | 77 images |
| Bouteloua rigidiseta (Steud.) Hitchc. | 21 images |
| Bouteloua simplex Lag. | 10 images |
| Bowlesia incana Ruiz & Pav. | 353 images |
| Bradburia pilosa (Nutt.) Semple | 10 images |
| Brasenia schreberi J.F.Gmel. | 16 images |
| Brassica juncea (L.) Czern. | 1741 images |
| Brassica napus L. | 10172 images |
| Brassica oleracea L. | 9068 images |
| Brassica rapa L. | 4105 images |
| Brickellia californica (Torr. & A.Gray) A.Gray | 45 images |
| Brickellia eupatorioides (L.) Shinners | 86 images |
| Brickellia grandiflora (Hook.) Nutt. | 9 images |
| Briza maxima L. | 2104 images |
| Briza media L. | 1156 images |
| Briza minor L. | 353 images |
| Bromus arvensis L. | 156 images |
| Bromus carinatus Hook. & Arn. | 31 images |
| Bromus catharticus Vahl | 484 images |
| Bromus ciliatus L. | 1 images |
| Bromus commutatus Schrad. | 103 images |
| Bromus diandrus Roth | 1392 images |
| Bromus erectus Huds. | 1162 images |
| Bromus hordeaceus L. | 3131 images |
| Bromus inermis Leyss. | 859 images |
| Bromus kalmii A.Gray | 1 images |
| Bromus latiglumis (Shear) Hitchc. | 2 images |
| Bromus madritensis L. | 558 images |
| Bromus marginatus Nees ex Steud. | 1 images |
| Bromus pubescens Muhl. ex Willd. | 5 images |
| Bromus racemosus L. | 192 images |
| Bromus rigidus Roth | 14 images |
| Bromus secalinus L. | 252 images |
| Bromus squarrosus L. | 129 images |
| Bromus sterilis L. | 2944 images |
| Bromus tectorum L. | 462 images |
| Broussonetia papyrifera (L.) L'Hér. ex Vent. | 3097 images |
| Brunnera macrophylla (Adams) I.M.Johnst. | 4618 images |
| Brunnichia ovata (Walter) Shinners | 26 images |
| Buddleja davidii Franch. | 17900 images |
| Buglossoides arvensis (L.) I.M.Johnst. | 1193 images |
| Buglossoides incrassata (Guss.) I.M.Johnst. | 41 images |
| Bulbostylis capillaris (L.) Kunth ex C.B.Clarke | 2 images |
| Bunias orientalis L. | 2649 images |
| Bupleurum rotundifolium L. | 549 images |
| Burmannia capitata (Walter ex J.F.Gmel.) Mart. | 161 images |
| Butomus umbellatus L. | 1820 images |
| Cabomba caroliniana A.Gray | 63 images |
| Cakile edentula (Bigelow) Hook. | 282 images |
| Calamagrostis breviligulata (Fernald) Saarela | 69 images |
| Calamagrostis canadensis (Michx.) P.Beauv. | 4 images |
| Calamagrostis epigejos (L.) Roth | 3482 images |
| Calamagrostis purpurea (Trin.) Trin. | 25 images |
| Calamagrostis stricta (Timm) Koeler | 35 images |
| Calendula officinalis L. | 16408 images |
| Calla palustris L. | 1454 images |
| Callicarpa americana L. | 3800 images |
| Callirhoe bushii Fernald | 6 images |
| Callirhoe digitata Nutt. | 157 images |
| Callirhoe involucrata (Torr. & A.Gray) A.Gray | 58 images |
| Callitriche fassettii Schotsman | 2 images |
| Callitriche hermaphroditica L. | 7 images |
| Callitriche heterophylla Pursh | 3 images |
| Callitriche palustris L. | 434 images |
| Callitriche stagnalis Scop. | 755 images |
| Callitriche terrestris Raf. | 5 images |
| Calluna vulgaris (L.) Hull | 10079 images |
| Calochortus gunnisonii S.Watson | 86 images |
| Calochortus nuttallii Torr. | 54 images |
| Calopogon tuberosus (L.) Britton, Sterns & Poggenb. | 79 images |
| Caltha palustris L. | 11083 images |
| Calycanthus floridus L. | 2485 images |
| Calycocarpum lyonii (Pursh) Nutt. ex A.Gray | 1 images |
| Calypso bulbosa (L.) Oakes | 454 images |
| Calystegia hederacea Wall. | 18 images |
| Calystegia sepium (L.) R.Br. | 10489 images |
| Calystegia silvatica (Kit.) Griseb. | 2752 images |
| Calystegia spithamaea (L.) Pursh | 19 images |
| Camassia angusta (Engelm. & A.Gray) Blank. | 5 images |
| Camassia scilloides (Raf.) Cory | 150 images |
| Camelina alyssum (Mill.) Thell. | 3 images |
| Camelina microcarpa Andrz. ex DC. | 117 images |
| Camelina rumelica Velen. | 18 images |
| Camelina sativa (L.) Crantz | 238 images |
| Campanula cervicaria L. | 230 images |
| Campanula glomerata L. | 8658 images |
| Campanula persicifolia L. | 10968 images |
| Campanula rapunculoides L. | 6045 images |
| Campanula trachelium L. | 11025 images |
| Campanulastrum americanum (L.) Small | 399 images |
| Campsis radicans (L.) Bureau | 7843 images |
| Canavalia ensiformis (L.) DC. | 56 images |
| Cannabis sativa L. | 5902 images |
| Capnoides sempervirens (L.) Borkh. | 122 images |
| Capsella bursa-pastoris (L.) Medik. | 10272 images |
| Caragana arborescens Lam. | 1893 images |
| Cardamine bulbosa (Schreb. ex Muhl.) Britton, Sterns & Poggenb. | 27 images |
| Cardamine concatenata (Michx.) O.Schwarz | 395 images |
| Cardamine diphylla (Michx.) Alph.Wood | 66 images |
| Cardamine douglassii Britton | 7 images |
| Cardamine flexuosa With. | 5554 images |
| Cardamine hirsuta L. | 4151 images |
| Cardamine impatiens L. | 1841 images |
| Cardamine parviflora L. | 1982 images |
| Cardamine pensylvanica Muhl. ex Willd. | 7 images |
| Cardamine pratensis L. | 17380 images |
| Cardiospermum halicacabum L. | 1362 images |
| Carduus acanthoides L. | 4211 images |
| Carduus crispus L. | 901 images |
| Carduus nutans L. | 5172 images |
| Carex albolutescens Schwein. | 5 images |
| Carex aquatilis Wahlenb. | 21 images |
| Carex arcta Boott | 6 images |
| Carex atherodes Spreng. | 5 images |
| Carex aurea Nutt. | 18 images |
| Carex blanda Dewey | 41 images |
| Carex bromoides Willd. | 4 images |
| Carex brunnescens (Pers.) Poir. | 41 images |
| Carex bushii Mack. | 5 images |
| Carex buxbaumii Wahlenb. | 72 images |
| Carex canescens L. | 138 images |
| Carex capillaris L. | 52 images |
| Carex careyana Torr. ex Dewey | 8 images |
| Carex caroliniana Schwein. | 1 images |
| Carex cephalophora Muhl. ex Willd. | 20 images |
| Carex cherokeensis Schwein. | 19 images |
| Carex chordorrhiza L.f. | 39 images |
| Carex comosa Boott | 44 images |
| Carex conjuncta Boott | 6 images |
| Carex crinita Lam. | 82 images |
| Carex crus-corvi Shuttlew. ex Kunze | 1 images |
| Carex cryptolepis Mack. | 8 images |
| Carex cumulata (L.H.Bailey) Mack. | 1 images |
| Carex decomposita Muhl. | 3 images |
| Carex deweyana Schwein. | 7 images |
| Carex diandra Schrank | 81 images |
| Carex disperma Dewey | 3 images |
| Carex eburnea Boott | 28 images |
| Carex echinata Murray | 315 images |
| Carex emoryi Dewey | 8 images |
| Carex festucacea Willd. | 1 images |
| Carex filifolia Nutt. | 8 images |
| Carex flaccosperma Dewey | 28 images |
| Carex flava L. | 328 images |
| Carex folliculata L. | 5 images |
| Carex formosa Dewey | 1 images |
| Carex frankii Kunth | 25 images |
| Carex garberi Fernald | 1 images |
| Carex gracillima Schwein. | 24 images |
| Carex granularis Muhl. ex Willd. | 12 images |
| Carex grayi J.Carey | 309 images |
| Carex grisea Wahlenb. | 22 images |
| Carex hirsutella Mack. | 14 images |
| Carex hirta L. | 934 images |
| Carex hirtifolia Mack. | 9 images |
| Carex hitchcockiana Dewey | 1 images |
| Carex hoodii Boott | 3 images |
| Carex hyalinolepis Steud. | 5 images |
| Carex hystericina Muhl. ex Willd. | 33 images |
| Carex inops L.H.Bailey | 1 images |
| Carex intumescens Rudge | 122 images |
| Carex jamesii Schwein. | 9 images |
| Carex lacustris Willd. | 15 images |
| Carex laeviconica Dewey | 3 images |
| Carex laevivaginata (Kük.) Mack. | 1 images |
| Carex lasiocarpa Ehrh. | 53 images |
| Carex laxiflora Lam. | 8 images |
| Carex lenticularis Michx. | 5 images |
| Carex leporina L. | 331 images |
| Carex limosa L. | 121 images |
| Carex livida (Wahlenb.) Willd. | 6 images |
| Carex longii Mack. | 13 images |
| Carex lupuliformis Sartwell ex Dewey | 8 images |
| Carex lupulina Muhl. ex Willd. | 91 images |
| Carex lurida Wahlenb. | 127 images |
| Carex magellanica Lam. | 67 images |
| Carex meadii Dewey | 6 images |
| Carex melanostachya M.Bieb. ex Willd. | 56 images |
| Carex mesochorea Mack. | 2 images |
| Carex michauxiana Boeckeler | 3 images |
| Carex microdonta Torr. | 1 images |
| Carex microptera Mack. | 5 images |
| Carex molesta Mack. | 8 images |
| Carex muehlenbergii Willd. | 3 images |
| Carex muskingumensis Schwein. | 148 images |
| Carex nigromarginata Schwein. | 3 images |
| Carex normalis Mack. | 17 images |
| Carex obtusata Lilj. | 5 images |
| Carex oederi Retz. | 311 images |
| Carex oligosperma Michx. | 9 images |
| Carex pallescens L. | 350 images |
| Carex pauciflora Lightf. | 91 images |
| Carex pedunculata Muhl. ex Willd. | 22 images |
| Carex pensylvanica Lam. | 92 images |
| Carex perdentata S.D.Jones | 2 images |
| Carex planostachys Kunze | 5 images |
| Carex plantaginea Lam. | 197 images |
| Carex platyphylla J.Carey | 8 images |
| Carex prairea Dewey ex Alph.Wood | 2 images |
| Carex praticola Rydb. | 1 images |
| Carex pseudocyperus L. | 509 images |
| Carex radiata (Wahlenb.) Small | 39 images |
| Carex retrorsa Schwein. | 12 images |
| Carex rosea Willd. | 1 images |
| Carex rostrata Stokes | 372 images |
| Carex rupestris All. | 51 images |
| Carex sartwellii Dewey | 4 images |
| Carex scabrata Schwein. | 11 images |
| Carex scirpoidea Michx. | 2 images |
| Carex shortiana Dewey & Torr. | 4 images |
| Carex sparganioides Muhl. ex Willd. | 18 images |
| Carex spicata Huds. | 439 images |
| Carex sprengelii Dewey ex Spreng. | 7 images |
| Carex squarrosa L. | 29 images |
| Carex sterilis Willd. | 3 images |
| Carex stipata Muhl. ex Willd. | 63 images |
| Carex straminea Willd. ex Schkuhr | 1 images |
| Carex stricta Lam. | 52 images |
| Carex supina Willd. ex Wahlenb. | 2 images |
| Carex swanii (Fernald) Mack. | 8 images |
| Carex tenera Dewey | 8 images |
| Carex tenuiflora Wahlenb. | 2 images |
| Carex tetrastachya Scheele | 6 images |
| Carex torta Boott ex Tuck. | 5 images |
| Carex tribuloides Wahlenb. | 26 images |
| Carex trichocarpa Muhl. ex Willd. | 15 images |
| Carex typhina Michx. | 4 images |
| Carex utriculata Boott | 9 images |
| Carex vaginata Tausch | 64 images |
| Carex vallicola Dewey | 2 images |
| Carex vesicaria L. | 342 images |
| Carex virescens Muhl. ex Willd. | 6 images |
| Carex vulpinoidea Michx. | 139 images |
| Carex woodii Dewey | 2 images |
| Carpinus caroliniana Walter | 522 images |
| Carthamus lanatus L. | 1819 images |
| Carthamus tinctorius L. | 1086 images |
| Carum carvi L. | 1554 images |
| Carya aquatica (F.Michx.) Nutt. ex Elliott | 14 images |
| Carya cordiformis (Wangenh.) K.Koch | 114 images |
| Carya glabra (Mill.) Sweet | 2601 images |
| Carya illinoinensis (Wangenh.) K.Koch | 1049 images |
| Carya laciniosa (F.Michx.) G.Don | 29 images |
| Carya myristiciformis (F.Michx.) Nutt. ex Elliott | 3 images |
| Carya ovata (Mill.) K.Koch | 446 images |
| Carya pallida (Ashe) Engelm. & Graebn. | 26 images |
| Carya tomentosa (Lam.) Nutt. | 117 images |
| Caryopteris incana (Thunb. ex Houtt.) Miq. | 86 images |
| Castanea dentata (Marshall) Borkh. | 1032 images |
| Castanea mollissima Blume | 97 images |
| Castanea pumila (L.) Mill. | 62 images |
| Castilleja angustifolia (Nutt.) G.Don | 7 images |
| Castilleja coccinea (L.) Spreng. | 109 images |
| Castilleja indivisa Engelm. | 335 images |
| Castilleja septentrionalis Lindl. | 28 images |
| Castilleja sessiliflora Pursh | 14 images |
| Catabrosa aquatica (L.) P.Beauv. | 75 images |
| Catalpa bignonioides Walter | 15375 images |
| Catalpa ovata G.Don | 2308 images |
| Catalpa speciosa Teas | 778 images |
| Caulophyllum thalictroides (L.) Michx. | 502 images |
| Cayaponia quinqueloba (Raf.) Shinners | 4 images |
| Ceanothus americanus L. | 853 images |
| Ceanothus fendleri A.Gray | 4 images |
| Ceanothus herbaceus Raf. | 35 images |
| Ceanothus velutinus Douglas ex Hook. | 108 images |
| Celastrus orbiculatus Thunb. | 962 images |
| Celastrus scandens L. | 1150 images |
| Celosia argentea L. | 10900 images |
| Celosia floribunda A.Gray | 2 images |
| Celtis laevigata Willd. | 663 images |
| Celtis occidentalis L. | 4373 images |
| Celtis tenuifolia Nutt. | 46 images |
| Cenchrus alopecuroides (L.) Thunb. | 858 images |
| Cenchrus americanus (L.) Morrone | 142 images |
| Cenchrus ciliaris L. | 540 images |
| Cenchrus echinatus L. | 145 images |
| Cenchrus latifolius (Spreng.) Morrone | 8 images |
| Cenchrus longispinus (Hack.) Fernald | 95 images |
| Cenchrus petiolaris (Hochst.) Morrone | 1 images |
| Cenchrus spinifex Cav. | 44 images |
| Centaurea benedicta (L.) L. | 368 images |
| Centaurea calcitrapa L. | 1902 images |
| Centaurea cyanus L. | 18203 images |
| Centaurea diffusa Lam. | 256 images |
| Centaurea diluta Aiton | 27 images |
| Centaurea iberica Trevir. ex Spreng. | 71 images |
| Centaurea jacea L. | 15482 images |
| Centaurea macrocephala Muss.Puschk. ex Willd. | 555 images |
| Centaurea melitensis L. | 844 images |
| Centaurea montana L. | 9828 images |
| Centaurea nigra L. | 9217 images |
| Centaurea nigrescens Willd. | 1283 images |
| Centaurea phrygia L. | 605 images |
| Centaurea scabiosa L. | 9557 images |
| Centaurea solstitialis L. | 1396 images |
| Centaurea stoebe L. | 1138 images |
| Centaurium pulchellum (Sw.) Hayek ex Hand.-Mazz., Stadlm., Janch. & Faltis | 65 images |
| Centrosema virginianum (L.) Benth. | 552 images |
| Cephalanthus occidentalis L. | 1537 images |
| Cephalaria gigantea (Ledeb.) Bobrov | 773 images |
| Cerastium arvense L. | 5449 images |
| Cerastium brachypetalum Desp. ex Pers. | 69 images |
| Cerastium diffusum Pers. | 142 images |
| Cerastium glomeratum Thuill. | 4805 images |
| Cerastium holosteoides Fr. | 13 images |
| Cerastium nutans Raf. | 9 images |
| Cerastium pumilum Curtis | 421 images |
| Cerastium semidecandrum L. | 500 images |
| Cerastium tomentosum L. | 7024 images |
| Ceratophyllum demersum L. | 383 images |
| Cercis canadensis L. | 7162 images |
| Cercocarpus montanus Raf. | 205 images |
| Cevallia sinuata Lag. | 8 images |
| Chaenomeles japonica (Thunb.) Lindl. ex Spach | 10519 images |
| Chaenomeles speciosa (Sweet) Nakai | 7749 images |
| Chaenorhinum minus (L.) Lange | 812 images |
| Chaerophyllum procumbens (L.) Crantz | 16 images |
| Chaerophyllum tainturieri Hook. & Arn. | 213 images |
| Chaiturus marrubiastrum (L.) Ehrh. ex Rchb. | 89 images |
| Chamaecrista fasciculata (Michx.) Greene | 968 images |
| Chamaecrista nictitans (L.) Moench | 254 images |
| Chamaedaphne calyculata (L.) Moench | 192 images |
| Chamaelirium luteum (L.) A.Gray | 48 images |
| Chamaemelum nobile (L.) All. | 2923 images |
| Chamaerhodos erecta (L.) Bunge | 1 images |
| Chasmanthium latifolium (Michx.) H.O.Yates | 567 images |
| Chelidonium majus L. | 27624 images |
| Chelone glabra L. | 546 images |
| Chelone obliqua L. | 298 images |
| Chenopodiastrum murale (L.) S.Fuentes, Uotila & Borsch | 1576 images |
| Chenopodium album L. | 15833 images |
| Chenopodium berlandieri Moq. | 50 images |
| Chenopodium betaceum Andrz. | 9 images |
| Chenopodium ficifolium Sm. | 2074 images |
| Chenopodium opulifolium Schrad. ex W.D.J.Koch & Ziz | 9 images |
| Chenopodium pratericola Rydb. | 26 images |
| Chenopodium standleyanum Aellen | 3 images |
| Chenopodium vulvaria L. | 1007 images |
| Chimaphila maculata (L.) Pursh | 847 images |
| Chimaphila umbellata (L.) W.P.C.Barton | 162 images |
| Chionanthus virginicus L. | 780 images |
| Chloracantha spinosa (Benth.) G.L.Nesom | 5 images |
| Chloris cucullata Bisch. | 7 images |
| Chloris gayana Kunth | 140 images |
| Chloris verticillata Nutt. | 33 images |
| Chloris virgata Sw. | 82 images |
| Chondrilla juncea L. | 2277 images |
| Chorispora tenella (Pall.) DC. | 224 images |
| Chrysosplenium americanum Schwein. ex Hook. | 27 images |
| Cichorium intybus L. | 20502 images |
| Cicuta bulbifera L. | 42 images |
| Cicuta maculata L. | 380 images |
| Cinna arundinacea L. | 19 images |
| Circaea alpina L. | 283 images |
| Circaea canadensis (L.) Hill | 78 images |
| Cirsium altissimum (L.) Spreng. | 316 images |
| Cirsium arvense (L.) Scop. | 18115 images |
| Cirsium discolor (Muhl. ex Willd.) Spreng. | 258 images |
| Cirsium flodmanii Arthur | 9 images |
| Cirsium horridulum Michx. | 266 images |
| Cirsium muticum Michx. | 72 images |
| Cirsium ochrocentrum A.Gray | 4 images |
| Cirsium palustre (L.) Scop. | 4703 images |
| Cirsium texanum Buckley | 240 images |
| Cirsium undulatum Spreng. | 128 images |
| Cirsium vulgare (Savi) Ten. | 22291 images |
| Cissus trifoliata (L.) L. | 21 images |
| Citrullus lanatus (Thunb.) Matsum. & Nakai | 2616 images |
| Citrus trifoliata L. | 2917 images |
| Cladium mariscoides (Muhl.) Torr. | 3 images |
| Cladrastis kentukea (Dum.Cours.) Rudd | 446 images |
| Clarkia pulchella Pursh | 55 images |
| Claytonia caroliniana Michx. | 318 images |
| Claytonia rubra (Howell) Tidestr. | 74 images |
| Claytonia virginica L. | 1241 images |
| Clematis columbiana (Nutt.) Torr. & A.Gray | 6 images |
| Clematis crispa L. | 112 images |
| Clematis fremontii S.Watson | 7 images |
| Clematis hirsutissima Pursh | 35 images |
| Clematis integrifolia L. | 857 images |
| Clematis ligusticifolia Nutt. | 98 images |
| Clematis occidentalis (Hornem.) DC. | 63 images |
| Clematis pitcheri Torr. & A.Gray | 4 images |
| Clematis terniflora DC. | 1176 images |
| Clematis versicolor Small | 4 images |
| Clematis viorna L. | 88 images |
| Clematis virginiana L. | 1115 images |
| Cleome dodecandra L. | 156 images |
| Cleome erosa (Nutt.) Eaton | 3 images |
| Cleome gynandra L. | 502 images |
| Cleome houtteana Schltdl. | 2818 images |
| Cleome spinosa Jacq. | 1275 images |
| Cleomella lutea (Hook.) Roalson & J.C.Hall | 20 images |
| Cleomella serrulata (Pursh) Roalson & J.C.Hall | 106 images |
| Clinopodium acinos (L.) Kuntze | 850 images |
| Clinopodium arkansanum (Nutt.) House | 1 images |
| Clinopodium nepeta (L.) Kuntze | 7753 images |
| Clinopodium vulgare L. | 8848 images |
| Clintonia borealis (Aiton) Raf. | 822 images |
| Clitoria mariana L. | 146 images |
| Cnidoscolus texanus (Müll.Arg.) Small | 2 images |
| Cocculus carolinus (L.) DC. | 393 images |
| Coleataenia anceps (Michx.) Soreng | 3 images |
| Collinsia heterophylla Buist ex Graham | 11 images |
| Collinsia parviflora Douglas ex Lindl. | 50 images |
| Collinsia verna Nutt. | 72 images |
| Collinsia violacea Nutt. | 11 images |
| Collinsonia canadensis L. | 154 images |
| Collomia linearis Nutt. | 41 images |
| Comandra umbellata (L.) Nutt. | 103 images |
| Comarum palustre L. | 1206 images |
| Commelina caroliniana Walter | 8 images |
| Commelina communis L. | 2508 images |
| Commelina diffusa Burm.f. | 637 images |
| Commelina erecta L. | 1996 images |
| Commelina virginica L. | 60 images |
| Comptonia peregrina (L.) Coult. | 253 images |
| Conium maculatum L. | 8359 images |
| Conoclinium coelestinum DC. | 1333 images |
| Conopholis americana (L.) Wallr. | 339 images |
| Conringia orientalis (L.) C.Presl | 4 images |
| Convallaria majalis L. | 7882 images |
| Convolvulus arvensis L. | 18661 images |
| Convolvulus equitans Benth. | 146 images |
| Coptis trifolia (L.) Salisb. | 276 images |
| Corallorhiza maculata Raf. | 330 images |
| Corallorhiza odontorhiza (Willd.) Nutt. | 2 images |
| Corallorhiza striata Lindl. | 139 images |
| Corallorhiza trifida Châtel. | 204 images |
| Corallorhiza wisteriana Conrad | 34 images |
| Coreopsis grandiflora Hogg ex Sweet | 3001 images |
| Coreopsis lanceolata L. | 3233 images |
| Coreopsis palmata Nutt. | 71 images |
| Coreopsis pubescens Elliott | 24 images |
| Coreopsis tinctoria Nutt. | 3621 images |
| Coreopsis tripteris L. | 200 images |
| Coriandrum sativum L. | 3520 images |
| Corispermum americanum (Nutt.) Nutt. | 2 images |
| Corispermum pallasii Steven | 119 images |
| Cornus alba L. | 4762 images |
| Cornus alternifolia L.f. | 403 images |
| Cornus amomum Mill. | 738 images |
| Cornus canadensis L. | 1587 images |
| Cornus drummondii C.A.Mey. | 40 images |
| Cornus florida L. | 6301 images |
| Cornus foemina Mill. | 45 images |
| Cornus mas L. | 12978 images |
| Cornus racemosa Lam. | 633 images |
| Cornus rugosa Lam. | 295 images |
| Cornus sericea L. | 8155 images |
| Coronilla varia L. | 11116 images |
| Corydalis aurea Willd. | 105 images |
| Corydalis flavula (Raf.) DC. | 99 images |
| Corylus americana Walter | 89 images |
| Corylus cornuta Marshall | 1972 images |
| Coryphopteris simulata (Davenp.) S.E.Fawc. | 1 images |
| Cosmos bipinnatus Cav. | 15037 images |
| Cosmos parviflorus (Jacq.) Pers. | 45 images |
| Cosmos sulphureus Cav. | 4523 images |
| Cota tinctoria (L.) J.Gay | 2848 images |
| Cotinus coggygria Scop. | 15274 images |
| Cotinus obovatus Raf. | 521 images |
| Cotoneaster acutifolius Turcz. | 999 images |
| Cotoneaster divaricatus Rehder & E.H.Wilson | 698 images |
| Cotoneaster multiflorus Bunge | 438 images |
| Crassula aquatica (L.) Schönland | 9 images |
| Crataegus atrorubens Ashe | 2 images |
| Crataegus calpodendron (Ehrh.) Medik. | 10 images |
| Crataegus chrysocarpa Ashe | 17 images |
| Crataegus coccinea L. | 235 images |
| Crataegus coccinioides Ashe | 24 images |
| Crataegus collina Chapm. | 4 images |
| Crataegus crus-galli L. | 908 images |
| Crataegus douglasii Lindl. | 489 images |
| Crataegus fecunda Sarg. | 4 images |
| Crataegus fluviatilis Sarg. | 2 images |
| Crataegus holmesiana Ashe | 28 images |
| Crataegus intricata Lange | 10 images |
| Crataegus irrasa Sarg. | 3 images |
| Crataegus macracantha Lodd. ex Loudon | 10 images |
| Crataegus macrosperma Ashe | 10 images |
| Crataegus magniflora Sarg. | 3 images |
| Crataegus marshallii Eggl. | 91 images |
| Crataegus mollis (Torr. & A.Gray) Scheele | 42 images |
| Crataegus monogyna Jacq. | 25768 images |
| Crataegus nitida (Engelm. ex Britton & N.E.Br.) Sarg. | 4 images |
| Crataegus phaenopyrum (L.f.) Medik. | 244 images |
| Crataegus pruinosa (H.L.Wendl.) K.Koch | 9 images |
| Crataegus punctata Jacq. | 100 images |
| Crataegus scabrida Sarg. | 5 images |
| Crataegus submollis Sarg. | 284 images |
| Crataegus succulenta Schrad. ex Link | 15 images |
| Crataegus uniflora Münchh. | 17 images |
| Crataegus viridis L. | 36 images |
| Crepis acuminata Nutt. | 43 images |
| Crepis capillaris (L.) Wallr. | 10480 images |
| Crepis foetida L. | 2335 images |
| Crepis occidentalis Nutt. | 45 images |
| Crepis pulchra L. | 1147 images |
| Crepis setosa Haller f. | 2981 images |
| Crepis tectorum L. | 461 images |
| Cressa truxillensis Kunth | 21 images |
| Crocanthemum bicknellii (Fernald) Janch. | 4 images |
| Crocanthemum canadense (L.) Britton | 1 images |
| Crocanthemum georgianum (Chapm.) Barnhart | 7 images |
| Crocanthemum rosmarinifolium (Pursh) Janch. | 3 images |
| Croptilon divaricatum (Nutt.) Raf. | 17 images |
| Crotalaria sagittalis L. | 61 images |
| Crotalaria spectabilis Roth | 189 images |
| Croton capitatus Michx. | 235 images |
| Croton glandulosus L. | 94 images |
| Croton monanthogynus Michx. | 126 images |
| Cruciata pedemontana (Bellardi) Ehrend. | 135 images |
| Cryptantha minima Rydb. | 9 images |
| Cryptogramma acrostichoides R.Br. | 1 images |
| Cryptotaenia canadensis (L.) DC. | 279 images |
| Cucumis melo L. | 5337 images |
| Cucumis sativus L. | 5251 images |
| Cucurbita foetidissima Kunth | 285 images |
| Cucurbita maxima Duchesne | 5655 images |
| Cucurbita pepo L. | 5758 images |
| Cunila origanoides (L.) Britton | 52 images |
| Cuphea viscosissima Jacq. | 73 images |
| Cuscuta approximata Bab. | 43 images |
| Cuscuta campestris Yunck. | 700 images |
| Cuscuta cephalanthi Engelm. | 4 images |
| Cuscuta compacta Juss. ex Choisy | 1 images |
| Cuscuta epithymum (L.) L. | 1260 images |
| Cuscuta glomerata Choisy | 2 images |
| Cuscuta gronovii Willd. ex Schult. | 4 images |
| Cuscuta indecora Choisy | 15 images |
| Cuscuta pentagona Engelm. | 12 images |
| Cuscuta polygonorum Engelm. | 2 images |
| Cuscuta suaveolens Ser. | 1 images |
| Cyclachaena xanthiifolia (Nutt.) Fresen. | 125 images |
| Cyclospermum leptophyllum (Pers.) Sprague ex Britton & P.Wilson | 436 images |
| Cydonia oblonga Mill. | 10890 images |
| Cylindropuntia davisii (Engelm. & J.M.Bigelow) F.M.Knuth | 5 images |
| Cylindropuntia imbricata (Haw.) F.M.Knuth | 556 images |
| Cylindropuntia leptocaulis (DC.) F.M.Knuth | 51 images |
| Cymbalaria muralis G.Gaertn., B.Mey. & Scherb. | 2321 images |
| Cymopterus glomeratus (Nutt.) DC. | 3 images |
| Cynanchum laeve (Michx.) Pers. | 234 images |
| Cynanchum rostellatum (Turcz.) Liede & Khanum | 23 images |
| Cynodon dactylon (L.) Pers. | 2859 images |
| Cynoglossum amabile Stapf & J.R.Drumm. | 1038 images |
| Cynoglossum creticum Mill. | 3832 images |
| Cynoglossum officinale L. | 3452 images |
| Cynosurus cristatus L. | 845 images |
| Cynosurus echinatus L. | 664 images |
| Cyperus bipartitus Torr. | 8 images |
| Cyperus brevifolius (Rottb.) Hassk. | 160 images |
| Cyperus compressus L. | 48 images |
| Cyperus difformis L. | 130 images |
| Cyperus erythrorhizos Muhl. | 1 images |
| Cyperus esculentus L. | 984 images |
| Cyperus flavescens L. | 69 images |
| Cyperus fuscus L. | 348 images |
| Cyperus granitophilus McVaugh | 1 images |
| Cyperus hortensis (Salzm. ex Steud.) Dorr | 143 images |
| Cyperus iria L. | 56 images |
| Cyperus lupulinus (Biehler) Marcks | 2 images |
| Cyperus odoratus L. | 123 images |
| Cyperus polystachyos Rottb. | 26 images |
| Cyperus pseudovegetus Steud. | 5 images |
| Cyperus reflexus Vahl | 3 images |
| Cyperus rotundus L. | 1154 images |
| Cyperus sesquiflorus (Torr.) Mattf. & Kük. | 32 images |
| Cyperus squarrosus L. | 27 images |
| Cyperus strigosus L. | 379 images |
| Cyperus subsquarrosus (Muhl.) Bauters | 161 images |
| Cyperus surinamensis Rottb. | 27 images |
| Cypripedium acaule Aiton | 948 images |
| Cypripedium candidum Muhl. ex Willd. | 44 images |
| Cypripedium kentuckiense C.F.Reed | 1 images |
| Cypripedium parviflorum Salisb. | 315 images |
| Cypripedium reginae Walter | 217 images |
| Cystopteris × tennesseensis Shaver | 13 images |
| Cystopteris bulbifera (L.) Bernh. | 97 images |
| Cystopteris fragilis (L.) Bernh. | 1280 images |
| Cystopteris protrusa (Weath.) Blasdell | 43 images |
| Cystopteris tenuis (Michx.) Desv. | 3 images |
| Dactylis glomerata L. | 11167 images |
| Dactyloctenium aegyptium (L.) Willd. | 437 images |
| Dactylorhiza viridis (L.) R.M.Bateman, Pridgeon & M.W.Chase | 919 images |
| Dalea candida Willd. | 18 images |
| Dalea compacta Spreng. | 18 images |
| Dalea cylindriceps Barneby | 8 images |
| Dalea formosa Torr. | 68 images |
| Dalea jamesii (Torr.) Torr. & A.Gray | 2 images |
| Dalea lanata Spreng. | 4 images |
| Dalea leporina (Aiton) Bullock | 28 images |
| Dalea multiflora (Nutt.) Shinners | 14 images |
| Dalea purpurea Vent. | 272 images |
| Dalea villosa (Nutt.) Spreng. | 3 images |
| Dalibarda repens L. | 31 images |
| Danthonia californica Bol. | 18 images |
| Danthonia compressa Austin | 4 images |
| Danthonia intermedia Vasey | 6 images |
| Danthonia unispicata (Thurb.) Munro ex Macoun | 21 images |
| Dasiphora fruticosa (L.) Rydb. | 7461 images |
| Dasistoma macrophylla (Nutt.) Raf. | 61 images |
| Datura innoxia Mill. | 1891 images |
| Datura quercifolia Kunth | 1 images |
| Datura stramonium L. | 15889 images |
| Datura wrightii Regel | 1457 images |
| Daucus carota L. | 27993 images |
| Daucus pusillus Michx. | 220 images |
| Decodon verticillatus (L.) Elliott | 62 images |
| Delphinium ajacis L. | 6705 images |
| Delphinium bicolor Nutt. | 9 images |
| Delphinium carolinianum Walter | 163 images |
| Delphinium consolida L. | 2926 images |
| Delphinium elatum L. | 5127 images |
| Delphinium exaltatum Aiton | 19 images |
| Delphinium hispanicum Willk. ex Costa | 38 images |
| Delphinium pubescens DC. | 69 images |
| Delphinium tricorne Michx. | 217 images |
| Dennstaedtia punctilobula (Michx.) T.Moore | 4 images |
| Deparia acrostichoides (Sw.) M.Kato | 53 images |
| Deschampsia cespitosa (L.) P.Beauv. | 620 images |
| Descurainia pinnata (Walter) Britton | 165 images |
| Descurainia sophia (L.) Webb ex Prantl | 828 images |
| Desmanthus illinoensis (Michx.) MacMill. ex B.L.Rob. & Fernald | 147 images |
| Desmodium canadense (L.) DC. | 286 images |
| Desmodium canescens (L.) DC. | 8 images |
| Desmodium glabellum (Michx.) DC. | 7 images |
| Desmodium illinoense A.Gray | 2 images |
| Desmodium paniculatum (L.) DC. | 606 images |
| Desmodium tweedyi Britton | 7 images |
| Deutzia crenata Siebold & Zucc. | 655 images |
| Dianthera americana L. | 196 images |
| Dianthus armeria L. | 2717 images |
| Dianthus barbatus L. | 11688 images |
| Dianthus carthusianorum L. | 6835 images |
| Dianthus deltoides L. | 4503 images |
| Dianthus plumarius L. | 1656 images |
| Diaperia prolifera (Nutt. ex DC.) Nutt. | 1 images |
| Diaperia verna (Raf.) Morefield | 8 images |
| Dicentra canadensis (Goldie) Walp. | 155 images |
| Dicentra cucullaria (L.) Bernh. | 663 images |
| Dicentra eximia (Ker Gawl.) Torr. | 115 images |
| Dichanthelium clandestinum (L.) Gould | 234 images |
| Dichanthelium latifolium (L.) Harvill | 2 images |
| Dichanthelium oligosanthes (Schult.) Gould | 36 images |
| Dichanthelium sabulorum (Lam.) Gould & C.A.Clark | 1 images |
| Dichanthelium scribnerianum (Nash) J.R.Thomas | 2 images |
| Dichodon viscidum (M.Bieb.) Holub | 43 images |
| Dichondra carolinensis Michx. | 230 images |
| Dicliptera brachiata Spreng. | 69 images |
| Diervilla lonicera Mill. | 735 images |
| Dieteria canescens (Pursh) Nutt. | 80 images |
| Digitalis grandiflora Mill. | 2849 images |
| Digitalis lanata Ehrh. | 242 images |
| Digitalis purpurea L. | 22060 images |
| Digitaria bicornis (Lam.) Roem. & Schult. | 5 images |
| Digitaria californica (Benth.) Henrard | 4 images |
| Digitaria ciliaris (Retz.) Koeler | 231 images |
| Digitaria filiformis (L.) Koeler | 7 images |
| Digitaria insularis (L.) Mez ex Ekman | 37 images |
| Digitaria ischaemum (Schreb.) Muhl. | 53 images |
| Digitaria sanguinalis (L.) Scop. | 2639 images |
| Digitaria violascens Link | 12 images |
| Dimorphocarpa candicans (Raf.) Rollins | 12 images |
| Diodia virginiana L. | 426 images |
| Dioscorea polystachya Turcz. | 55 images |
| Dioscorea villosa L. | 309 images |
| Diospyros virginiana L. | 2692 images |
| Diplachne fusca (L.) P.Beauv. ex Roem. & Schult. | 44 images |
| Diplotaxis muralis (L.) DC. | 947 images |
| Diplotaxis tenuifolia (L.) DC. | 6365 images |
| Dipsacus fullonum L. | 15221 images |
| Dipsacus laciniatus L. | 1088 images |
| Dirca palustris L. | 88 images |
| Distichlis spicata (L.) Greene | 93 images |
| Doellingeria umbellata (Mill.) Nees | 555 images |
| Draba glabella Pursh | 7 images |
| Draba incana L. | 28 images |
| Draba nemorosa L. | 84 images |
| Draba verna L. | 2785 images |
| Dracocephalum parviflorum Nutt. | 39 images |
| Drosera × obovata Mert. & W.D.J.Koch | 39 images |
| Drosera anglica Huds. | 310 images |
| Drosera brevifolia Pursh | 69 images |
| Drosera intermedia Hayne | 452 images |
| Drosera linearis Goldie | 17 images |
| Drosera rotundifolia L. | 1638 images |
| Drymocallis arguta (Pursh) Rydb. | 14 images |
| Dryopteris × boottii (Tuck.) Underw. | 4 images |
| Dryopteris × uliginosa (A.Braun ex Döll) Kuntze ex Druce | 1 images |
| Dryopteris carthusiana (Vill.) H.P.Fuchs | 971 images |
| Dryopteris celsa (W.Palmer) Knowlt., T.S.Palmer & Pollard ex Small | 4 images |
| Dryopteris clintoniana (D.C.Eaton) Dowell | 7 images |
| Dryopteris cristata (L.) A.Gray | 323 images |
| Dryopteris expansa (C.Presl) Fraser-Jenk. & Jermy | 124 images |
| Dryopteris filix-mas (L.) Schott | 7220 images |
| Dryopteris fragrans (L.) Schott | 33 images |
| Dryopteris goldieana (Hook. ex Goldie) A.Gray | 16 images |
| Dryopteris intermedia A.Gray | 12 images |
| Dryopteris marginalis (L.) A.Gray | 5 images |
| Dulichium arundinaceum (L.) Britton | 49 images |
| Dyschoriste linearis (Torr. & A.Gray) Kuntze | 34 images |
| Dysphania ambrosioides (L.) Mosyakin & Clemants | 1420 images |
| Dysphania anthelmintica (L.) Mosyakin & Clemants | 1 images |
| Dysphania atriplicifolia (Spreng.) G.Kadereit, Sukhor. & Uotila | 62 images |
| Dysphania botrys (L.) Mosyakin & Clemants | 135 images |
| Dysphania pumilio (R.Br.) Mosyakin & Clemants | 307 images |
| Dyssodia papposa (Vent.) Hitchc. | 29 images |
| Echinacea angustifolia DC. | 1876 images |
| Echinacea pallida (Nutt.) Nutt. | 913 images |
| Echinacea paradoxa Britton | 15 images |
| Echinacea purpurea (L.) Moench | 7466 images |
| Echinacea sanguinea Nutt. | 11 images |
| Echinacea simulata McGregor | 4 images |
| Echinocactus texensis Hopffer | 224 images |
| Echinocereus reichenbachii (Terscheck) Haage | 29 images |
| Echinocereus viridiflorus Engelm. | 99 images |
| Echinochloa colonum (L.) Link | 240 images |
| Echinochloa crus-galli (L.) P.Beauv. | 3191 images |
| Echinochloa frumentacea Link | 17 images |
| Echinochloa muricata (P.Beauv.) Fernald | 54 images |
| Echinochloa walteri (Pursh) A.Heller | 1 images |
| Echinocystis lobata (Michx.) Torr. & A.Gray | 918 images |
| Echinodorus berteroi (Spreng.) Fassett | 13 images |
| Echinops exaltatus Schrad. | 263 images |
| Echinops sphaerocephalus L. | 3469 images |
| Echium vulgare L. | 36403 images |
| Eclipta prostrata (L.) L. | 1430 images |
| Elaeagnus angustifolia L. | 5463 images |
| Elaeagnus commutata Bernh. ex Rydb. | 261 images |
| Elaeagnus multiflora Thunb. | 197 images |
| Elaeagnus umbellata Thunb. | 2871 images |
| Elatine rubella Rydb. | 6 images |
| Elatine triandra Schkuhr | 43 images |
| Eleocharis acicularis (L.) Roem. & Schult. | 60 images |
| Eleocharis atropurpurea (Retz.) J.Presl & C.Presl | 4 images |
| Eleocharis compressa Sull. | 16 images |
| Eleocharis erythropoda Steud. | 7 images |
| Eleocharis exigua (Kunth) Roem. & Schult. | 2 images |
| Eleocharis flavescens (Poir.) Urb. | 8 images |
| Eleocharis interstincta (Vahl) Roem. & Schult. | 8 images |
| Eleocharis macrostachya Britton | 11 images |
| Eleocharis mamillata (H.Lindb.) H.Lindb. | 1 images |
| Eleocharis obtusa (Willd.) Schult. | 40 images |
| Eleocharis ovata (Roth) Roem. & Schult. | 45 images |
| Eleocharis palustris (L.) Roem. & Schult. | 730 images |
| Eleocharis parvula (Roem. & Schult.) Link ex Bluff, Nees & Schauer | 41 images |
| Eleocharis quinqueflora (Hartmann) O.Schwarz | 55 images |
| Eleocharis uniglumis (Link) Schult. | 30 images |
| Elephantopus carolinianus Raeusch. | 60 images |
| Elephantopus tomentosus L. | 37 images |
| Eleusine indica (L.) Gaertn. | 1034 images |
| Eleusine tristachya (Lam.) Lam. | 162 images |
| Eleutherococcus sieboldianus (Makino) Koidz. | 14 images |
| Ellisia nyctelea (L.) L. | 58 images |
| Elodea canadensis Michx. | 254 images |
| Elodea densa (Planch.) Casp. | 124 images |
| Elodea nuttallii (Planch.) H.St.John | 97 images |
| Elsholtzia ciliata (Thunb.) Hyl. | 50 images |
| Elymus canadensis L. | 156 images |
| Elymus elymoides (Raf.) Swezey | 21 images |
| Elymus glaucus Buckley | 13 images |
| Elymus hystrix L. | 68 images |
| Elymus repens (L.) Gould | 729 images |
| Elymus riparius Wiegand | 5 images |
| Elymus villosus Muhl. ex Willd. | 7 images |
| Elymus violaceus (Hornem.) J.Feilberg | 8 images |
| Elymus virginicus L. | 66 images |
| Empetrum nigrum L. | 1439 images |
| Enemion biternatum Raf. | 8 images |
| Engelmannia peristenia (Raf.) Goodman & C.A.Lawson | 18 images |
| Enneapogon desvauxii P.Beauv. | 18 images |
| Epifagus virginiana (L.) Barton | 115 images |
| Epigaea repens L. | 194 images |
| Epilobium angustifolium L. | 19655 images |
| Epilobium brachycarpum C.Presl | 302 images |
| Epilobium ciliatum Raf. | 4680 images |
| Epilobium coloratum Biehler | 84 images |
| Epilobium hallianum Hausskn. | 1 images |
| Epilobium hirsutum L. | 15218 images |
| Epilobium hornemannii Rchb. | 25 images |
| Epilobium latifolium L. | 111 images |
| Epilobium leptophyllum Raf. | 9 images |
| Epilobium palustre L. | 514 images |
| Epilobium parviflorum Schreb. | 4787 images |
| Epipactis gigantea Douglas | 175 images |
| Epipactis helleborine (L.) Crantz | 7293 images |
| Equisetum × ferrissii Clute | 3 images |
| Equisetum × litorale Kühlew. ex Rupr. | 16 images |
| Equisetum arvense L. | 6597 images |
| Equisetum fluviatile L. | 892 images |
| Equisetum laevigatum A.Braun & Engelm. | 78 images |
| Equisetum palustre L. | 1032 images |
| Equisetum pratense Ehrh. | 442 images |
| Equisetum scirpoides Michx. | 82 images |
| Equisetum sylvaticum L. | 2613 images |
| Equisetum variegatum Schleich. ex F.Weber & D.Mohr | 110 images |
| Eragrostis barrelieri Daveau | 68 images |
| Eragrostis cilianensis (All.) Vignolo ex Janch. | 180 images |
| Eragrostis curvula (Schrad.) Nees | 86 images |
| Eragrostis hypnoides (Lam.) Britton, Sterns & Poggenb. | 5 images |
| Eragrostis japonica (Thunb.) Trin. | 5 images |
| Eragrostis lehmanniana Nees | 5 images |
| Eragrostis mexicana (Hornem.) Link | 28 images |
| Eragrostis minor Host | 334 images |
| Eragrostis pectinacea (Michx.) Nees | 28 images |
| Eragrostis pilosa (L.) P.Beauv. | 69 images |
| Eragrostis secundiflora J.Presl | 1 images |
| Eragrostis spectabilis (Pursh) Steud. | 205 images |
| Eranthis hyemalis (L.) Salisb. | 4200 images |
| Erechtites hieraciifolius (L.) Raf. ex DC. | 1981 images |
| Eremopyrum triticeum (Gaertn.) Nevski | 10 images |
| Erianthus alopecuroides (L.) Elliott | 24 images |
| Erianthus giganteus (Walter) P.Beauv. | 4 images |
| Erigenia bulbosa (Michx.) Nutt. | 72 images |
| Erigeron annuus (L.) Desf | 812 images |
| Erigeron caespitosus Nutt. | 5 images |
| Erigeron canadensis L. | 15153 images |
| Erigeron compositus Pursh | 38 images |
| Erigeron divaricatus Michx. | 28 images |
| Erigeron divergens Torr. & A.Gray | 9 images |
| Erigeron flagellaris A.Gray | 2 images |
| Erigeron formosissimus Greene | 6 images |
| Erigeron glabellus Nutt. | 117 images |
| Erigeron lonchophyllus Hook. | 13 images |
| Erigeron modestus A.Gray | 11 images |
| Erigeron philadelphicus L. | 3521 images |
| Erigeron pulchellus Michx. | 255 images |
| Erigeron pumilus Nutt. | 80 images |
| Erigeron speciosus (Lindl.) DC. | 1234 images |
| Erigeron strigosus Muhl. ex Willd. | 5990 images |
| Erigeron vetensis Rydb. | 5 images |
| Eriocaulon aquaticum (Hill) Druce | 40 images |
| Eriochloa villosa (Thunb.) Kunth | 6 images |
| Eriocoma hymenoides (Roem. & Schult.) Rydb. | 1 images |
| Eriocoma nelsonii (Scribn.) Romasch. | 1 images |
| Eriogonum alatum Torr. | 9 images |
| Eriogonum annuum Nutt. | 19 images |
| Eriogonum brevicaule Nutt. | 2 images |
| Eriogonum cernuum Nutt. | 12 images |
| Eriogonum flavum Nutt. ex Benth. | 11 images |
| Eriogonum jamesii Benth. | 12 images |
| Eriogonum lachnogynum Torr. ex Benth. | 6 images |
| Eriogonum longifolium Nutt. | 9 images |
| Eriogonum multiflorum Benth. | 16 images |
| Eriogonum tenellum Torr. | 4 images |
| Erioneuron pilosum (Buckley) Nash | 10 images |
| Eriophorum angustifolium Honck. | 2605 images |
| Eriophorum chamissonis C.A.Mey. | 1 images |
| Eriophorum vaginatum L. | 934 images |
| Eriophorum virginicum L. | 37 images |
| Eriophorum viridicarinatum (Engelm.) Fernald | 2 images |
| Erodium cicutarium (L.) L'Hér. | 13411 images |
| Eruca vesicaria (L.) Cav. | 4218 images |
| Erucastrum gallicum (Willd.) O.E.Schulz | 330 images |
| Eryngium aquaticum L. | 20 images |
| Eryngium hookeri Walp. | 13 images |
| Eryngium integrifolium Walter | 5 images |
| Eryngium leavenworthii Torr. & A.Gray | 125 images |
| Eryngium planum L. | 2349 images |
| Eryngium prostratum Nutt. ex DC. | 16 images |
| Eryngium yuccifolium Michx. | 505 images |
| Erysimum asperum (Nutt.) DC. | 116 images |
| Erysimum capitatum (Douglas) Greene | 15 images |
| Erysimum cheiranthoides L. | 1241 images |
| Erysimum repandum L. | 54 images |
| Erysimum virgatum Roth | 120 images |
| Erythranthe floribunda (Lindl.) G.L.Nesom | 9 images |
| Erythranthe guttata (DC.) G.L.Nesom | 897 images |
| Erythranthe moschata (Douglas ex Lindl.) G.L.Nesom | 15 images |
| Erythronium albidum Nutt. | 209 images |
| Erythronium americanum Ker Gawl. | 1439 images |
| Erythronium propullans A.Gray | 1 images |
| Erythronium rostratum W.Wolf | 13 images |
| Eschscholzia californica Cham. | 15030 images |
| Escobaria missouriensis (Sweet) D.R.Hunt | 18 images |
| Escobaria vivipara (Nutt.) Buxb. | 93 images |
| Euonymus alatus (Thunb.) Siebold | 3587 images |
| Euonymus americanus L. | 475 images |
| Euonymus atropurpureus Jacq. | 127 images |
| Euonymus europaeus L. | 21839 images |
| Euonymus fortunei (Turcz.) Hand.-Mazz. | 6887 images |
| Euonymus hamiltonianus Wall. | 111 images |
| Euonymus japonicus Thunb. | 8337 images |
| Euonymus maackii Rupr. | 49 images |
| Eupatorium altissimum L. | 138 images |
| Eupatorium capillifolium (Lam.) Small ex Porter & Britton | 617 images |
| Eupatorium hyssopifolium L. | 74 images |
| Eupatorium perfoliatum L. | 1033 images |
| Eupatorium rotundifolium L. | 38 images |
| Eupatorium serotinum Michx. | 1148 images |
| Eupatorium sessilifolium L. | 9 images |
| Euphorbia agraria M.Bieb. | 7 images |
| Euphorbia albomarginata Torr. & A.Gray | 35 images |
| Euphorbia corollata L. | 234 images |
| Euphorbia cyparissias L. | 16868 images |
| Euphorbia davidii Subils | 56 images |
| Euphorbia dentata Michx. | 27 images |
| Euphorbia glyptosperma Engelm. | 36 images |
| Euphorbia helioscopia L. | 8938 images |
| Euphorbia heterophylla L. | 1131 images |
| Euphorbia hirta L. | 1231 images |
| Euphorbia hypericifolia L. | 2051 images |
| Euphorbia lathyris L. | 9636 images |
| Euphorbia maculata L. | 960 images |
| Euphorbia marginata Pursh | 1615 images |
| Euphorbia myrsinites L. | 2328 images |
| Euphorbia nutans Lag. | 422 images |
| Euphorbia ophthalmica Pers. | 11 images |
| Euphorbia peplus L. | 7322 images |
| Euphorbia platyphyllos L. | 598 images |
| Euphorbia polygonifolia L. | 39 images |
| Euphorbia prostrata Aiton | 2283 images |
| Euphorbia saratoi Ardoino | 1 images |
| Euphorbia serpens Kunth | 594 images |
| Euphorbia serpillifolia Pers. | 8 images |
| Euphorbia virgata Waldst. & Kit. | 32 images |
| Euphrasia nemorosa (Pers.) Wallr. | 413 images |
| Euphrasia stricta J.P.Wolff ex J.F.Lehm. | 38 images |
| Euploca convolvulacea Nutt. | 4 images |
| Euploca procumbens (Mill.) Diane & Hilger | 28 images |
| Euploca tenella (Torr.) Feuillet & Halse | 41 images |
| Eurybia conspicua (Lindl.) G.L.Nesom | 11 images |
| Eurybia hemispherica (Alexander) G.L.Nesom | 3 images |
| Eurybia macrophylla (L.) Cass. | 1731 images |
| Eurybia schreberi (Nees) Nees | 24 images |
| Eustoma exaltatum (L.) Salisb. ex G.Don | 73 images |
| Eustoma russellianum (Hook.) G.Don | 1912 images |
| Euthamia graminifolia (L.) Nutt. | 866 images |
| Euthamia gymnospermoides Greene | 17 images |
| Euthamia leptocephala (Torr. & A.Gray) Greene ex Porter & Britton | 1 images |
| Euthamia occidentalis Nutt. | 47 images |
| Eutrochium fistulosum (Barratt) E.E.Lamont | 503 images |
| Eutrochium maculatum (L.) E.E.Lamont | 1735 images |
| Eutrochium purpureum (L.) E.E.Lamont | 298 images |
| Exochorda racemosa (Fortune ex Lindl.) Rehder | 16 images |
| Facelis retusa (Lam.) Sch.Bip. | 19 images |
| Fagopyrum esculentum Moench | 6640 images |
| Fagus grandifolia Ehrh. | 2612 images |
| Falcaria vulgaris Bernh. | 1122 images |
| Fallopia convolvulus (L.) Á.Löve | 1656 images |
| Fallopia dumetorum (L.) Holub | 1100 images |
| Fallopia scandens (L.) Holub | 28 images |
| Fallugia paradoxa (D.Don ex Tilloch & Taylor) Endl. ex Torr. | 45 images |
| Fatoua villosa (Thunb.) Nakai | 372 images |
| Festuca bromoides L. | 216 images |
| Festuca filiformis Pourr. | 187 images |
| Festuca idahoensis Elmer | 4 images |
| Festuca myuros L. | 345 images |
| Festuca occidentalis Hook. | 7 images |
| Festuca octoflora Walter | 10 images |
| Festuca ovina L. | 255 images |
| Festuca rubra L. | 414 images |
| Festuca trachyphylla (Hack.) Hack. | 20 images |
| Festuca valesiaca Schleich. ex Gaudin | 31 images |
| Filago arvensis L. | 227 images |
| Filipendula rubra (Hill) B.L.Rob. | 355 images |
| Filipendula ulmaria (L.) Maxim. | 14117 images |
| Fimbristylis autumnalis (L.) Roem. & Schult. | 287 images |
| Fimbristylis dichotoma (L.) Vahl | 77 images |
| Fimbristylis littoralis Gaudich. | 46 images |
| Fimbristylis vahlii (Lam.) Link | 20 images |
| Flaveria trinervia (Spreng.) C.Mohr | 77 images |
| Fleischmannia incarnata (Walter) R.M.King & H.Rob. | 15 images |
| Floerkea proserpinacoides Willd. | 46 images |
| Foeniculum vulgare Mill. | 12139 images |
| Forestiera acuminata (Michx.) Poir. | 18 images |
| Forestiera pubescens Nutt. | 106 images |
| Forsythia suspensa (Thunb.) Vahl | 5114 images |
| Forsythia viridissima Lindl. | 3497 images |
| Fragaria × ananassa (Duchesne ex Weston) Duchesne ex Rozier | 4546 images |
| Fragaria vesca L. | 12221 images |
| Fragaria virginiana Mill. | 460 images |
| Frangula alnus Mill. | 6991 images |
| Frangula caroliniana (Walter) A.Gray | 127 images |
| Frasera caroliniensis Walter | 58 images |
| Frasera speciosa Douglas ex Griseb. | 59 images |
| Fraxinus albicans Buckley | 1 images |
| Fraxinus americana L. | 5438 images |
| Fraxinus nigra Marshall | 30 images |
| Fraxinus pennsylvanica Marshall | 1953 images |
| Fraxinus profunda (Bush) Bush | 23 images |
| Fraxinus quadrangulata Michx. | 46 images |
| Fritillaria atropurpurea Nutt. | 82 images |
| Froelichia floridana (Nutt.) Moq. | 60 images |
| Froelichia gracilis (Hook.) Moq. | 35 images |
| Fuirena pumila (Torr.) Spreng. | 1 images |
| Fuirena simplex Vahl | 8 images |
| Fuirena squarrosa Michx. | 1 images |
| Fumaria officinalis L. | 7796 images |
| Fumaria vaillantii Loisel. | 287 images |
| Funastrum crispum (Benth.) Schltr. | 3 images |
| Funastrum cynanchoides (Decne.) Schltr. | 37 images |
| Gaillardia aestivalis (Walter) H.Rock | 20 images |
| Gaillardia aristata Pursh | 3080 images |
| Gaillardia pinnatifida Torr. | 78 images |
| Gaillardia pulchella Foug. | 3620 images |
| Gaillardia suavis (A.Gray & Engelm.) Britton & Rusby | 17 images |
| Galactia volubilis (L.) Britton | 5 images |
| Galearis rotundifolia (Banks ex Pursh) R.M.Bateman | 6 images |
| Galearis spectabilis (L.) Raf. | 163 images |
| Galeopsis angustifolia Ehrh. ex Hoffm. | 1001 images |
| Galeopsis bifida Boenn. | 723 images |
| Galeopsis ladanum L. | 782 images |
| Galeopsis tetrahit L. | 10129 images |
| Galinsoga parviflora Cav. | 3648 images |
| Galinsoga quadriradiata Ruiz & Pav. | 4618 images |
| Galium aparine L. | 13579 images |
| Galium asprellum Michx. | 16 images |
| Galium boreale L. | 1100 images |
| Galium circaezans Michx. | 81 images |
| Galium divaricatum Pourr. ex Lam. | 23 images |
| Galium labradoricum (Wiegand) Wiegand | 1 images |
| Galium mollugo L. | 10023 images |
| Galium obtusum Bigelow | 8 images |
| Galium odoratum (L.) Scop. | 7727 images |
| Galium palustre L. | 1936 images |
| Galium pilosum Aiton | 9 images |
| Galium spurium L. | 32 images |
| Galium sylvaticum L. | 1580 images |
| Galium tinctorium L. | 1 images |
| Galium tricornutum Dandy | 328 images |
| Galium trifidum L. | 42 images |
| Galium triflorum Michx. | 254 images |
| Galium verum L. | 11731 images |
| Galium virgatum Nutt. | 10 images |
| Gamochaeta antillana (Urb.) Anderb. | 39 images |
| Gamochaeta calviceps (Fernald) Cabrera | 1 images |
| Gamochaeta pensylvanica (Willd.) Cabrera | 81 images |
| Gamochaeta purpurea (L.) Cabrera | 105 images |
| Gaultheria hispidula (L.) Muhl. ex Bigelow | 82 images |
| Gaultheria procumbens L. | 1358 images |
| Gaylussacia baccata (Wangenh.) K.Koch | 71 images |
| Genista tinctoria L. | 2668 images |
| Gentiana affinis Griseb. | 42 images |
| Gentiana alba Muhl. ex J.McNab | 10 images |
| Gentiana andrewsii Griseb. | 160 images |
| Gentiana puberulenta J.S.Pringle | 2 images |
| Gentiana saponaria L. | 8 images |
| Gentiana septemfida Pall. | 119 images |
| Gentianella amarella (L.) Börner | 174 images |
| Gentianella quinquefolia (L.) Small | 22 images |
| Gentianopsis crinita (Froel.) Ma | 64 images |
| Gentianopsis virgata (Raf.) Holub | 14 images |
| Geocaulon lividum (Richardson) Fernald | 14 images |
| Geranium bicknellii Britton | 35 images |
| Geranium carolinianum L. | 1367 images |
| Geranium columbinum L. | 1476 images |
| Geranium dissectum L. | 6438 images |
| Geranium maculatum L. | 1498 images |
| Geranium molle L. | 8997 images |
| Geranium nepalense Sweet | 35 images |
| Geranium oreganum Howell | 16 images |
| Geranium pratense L. | 9291 images |
| Geranium pusillum L. | 9350 images |
| Geranium richardsonii Fisch. & Trautv. | 31 images |
| Geranium robertianum L. | 24276 images |
| Geranium rotundifolium L. | 4768 images |
| Geranium sanguineum L. | 10318 images |
| Geranium sibiricum L. | 607 images |
| Geranium sylvaticum L. | 9692 images |
| Geranium thunbergii Siebold & Zucc. | 20 images |
| Geranium viscosissimum Fisch. & C.A.Mey. | 122 images |
| Geum aleppicum Jacq. | 288 images |
| Geum canadense Jacq. | 116 images |
| Geum laciniatum Murray | 686 images |
| Geum macrophyllum Willd. | 4161 images |
| Geum rivale L. | 4145 images |
| Geum triflorum Pursh | 111 images |
| Geum urbanum L. | 15701 images |
| Geum vernum (Raf.) Torr. & A.Gray | 2 images |
| Geum virginianum L. | 13 images |
| Gilia achilleifolia Benth. | 68 images |
| Gilia capitata Sims | 580 images |
| Gillenia stipulata (Muhl. ex Willd.) Nutt. | 6 images |
| Gillenia trifoliata (L.) Moench | 155 images |
| Ginkgo biloba L. | 10634 images |
| Glaucium corniculatum (L.) Curtis | 126 images |
| Glaucium flavum Crantz | 5877 images |
| Glechoma hederacea L. | 27141 images |
| Gleditsia aquatica Marshall | 73 images |
| Gleditsia triacanthos L. | 12399 images |
| Glinus lotoides L. | 128 images |
| Glinus radiatus (Ruiz & Pav.) Rohrb. | 1 images |
| Glyceria canadensis (Michx.) Trin. | 17 images |
| Glyceria declinata Bréb. | 31 images |
| Glyceria fluitans (L.) R.Br. | 224 images |
| Glyceria grandis S.Watson | 1 images |
| Glyceria maxima (Hartm.) Holmb. | 446 images |
| Glyceria septentrionalis Hitchc. | 2 images |
| Glyceria striata (Lam.) Hitchc. | 49 images |
| Glycine max (L.) Merr. | 2563 images |
| Glycyrrhiza lepidota Pursh | 86 images |
| Gnaphalium exilifolium A.Nelson | 7 images |
| Gnaphalium palustre Nutt. | 37 images |
| Gnaphalium uliginosum L. | 1293 images |
| Gonolobus suberosus (L.) R.Br. | 3 images |
| Goodyera oblongifolia Raf. | 208 images |
| Goodyera pubescens (Willd.) R.Br. | 344 images |
| Goodyera repens (L.) R.Br. | 399 images |
| Goodyera tesselata G.Lodd. | 31 images |
| Gossypium hirsutum L. | 591 images |
| Gratiola lutea Raf. | 10 images |
| Gratiola neglecta Torr. | 21 images |
| Gratiola virginiana L. | 9 images |
| Grindelia ciliata (Nutt.) Spreng. | 11 images |
| Grindelia hirsutula Hook. & Arn. | 126 images |
| Grindelia lanceolata Nutt. | 43 images |
| Grindelia nuda Alph.Wood | 2 images |
| Grindelia squarrosa (Pursh) Dunal | 362 images |
| Guilleminea densa (Willd. ex Schult.) Moq. | 41 images |
| Guilleminea lanuginosa (Poir.) Benth. & Hook.f. | 3 images |
| Guizotia abyssinica (L.f.) Cass. | 1070 images |
| Gutierrezia sarothrae (Pursh) Britton & Rusby | 91 images |
| Gutierrezia texana (DC.) Torr. & A.Gray | 3 images |
| Gymnocarpium dryopteris (L.) Newman | 757 images |
| Gymnocarpium robertianum (Hoffm.) Newman | 313 images |
| Gymnocladus dioicus (L.) K.Koch | 678 images |
| Gypsophila acutifolia Steven ex Spreng. | 13 images |
| Gypsophila elegans M.Bieb. | 1334 images |
| Gypsophila paniculata L. | 1417 images |
| Gypsophila scorzonerifolia Ser. | 7 images |
| Gypsophila vaccaria (L.) Sm. | 1590 images |
| Habenaria repens Nutt. | 13 images |
| Hackelia deflexa (Wahlenb.) Opiz | 21 images |
| Hackelia floribunda (Lehm.) I.M.Johnst. | 21 images |
| Hackelia virginiana (L.) I.M.Johnst. | 177 images |
| Hackelochloa granularis (L.) Kuntze | 9 images |
| Halerpestes cymbalaria (Pursh) Greene | 19 images |
| Halesia carolina L. | 533 images |
| Hamamelis vernalis Sarg. | 18 images |
| Hamamelis virginiana L. | 3290 images |
| Hammarbya paludosa (L.) Kuntze | 34 images |
| Haploesthes greggii A.Gray | 2 images |
| Harperella nodosa (Rose) Rose | 5 images |
| Hasteola suaveolens (L.) Pojark. | 32 images |
| Hedeoma drummondii Benth. | 7 images |
| Hedeoma hispida Pursh | 4 images |
| Hedeoma pulegioides (L.) Pers. | 24 images |
| Hedera helix L. | 24755 images |
| Hedlundia thuringiaca (Nyman) Sennikov & Kurtto | 345 images |
| Hedysarum alpinum L. | 11 images |
| Hedysarum boreale Nutt. | 15 images |
| Helanthium tenellum (Mart. ex Schult.f.) J.G.Sm. | 3 images |
| Helenium amarum (Raf.) H.Rock | 428 images |
| Helenium autumnale L. | 1856 images |
| Helenium elegans DC. | 11 images |
| Helenium flexuosum Raf. | 73 images |
| Helenium microcephalum DC. | 21 images |
| Helianthella quinquenervis (Hook.) A.Gray | 3 images |
| Helianthus × laetiflorus Pers. | 2408 images |
| Helianthus angustifolius L. | 155 images |
| Helianthus annuus L. | 16236 images |
| Helianthus ciliaris DC. | 18 images |
| Helianthus decapetalus L. | 391 images |
| Helianthus divaricatus L. | 1290 images |
| Helianthus giganteus L. | 1512 images |
| Helianthus grosseserratus M.Martens | 57 images |
| Helianthus hirsutus Raf. | 83 images |
| Helianthus maximiliani Schrad. | 555 images |
| Helianthus microcephalus Torr. & A.Gray | 5 images |
| Helianthus mollis Buc'hoz | 111 images |
| Helianthus nuttallii Torr. & A.Gray | 12 images |
| Helianthus occidentalis Riddell | 43 images |
| Helianthus pauciflorus Nutt. | 202 images |
| Helianthus petiolaris Nutt. | 791 images |
| Helianthus salicifolius A.Dietr. | 231 images |
| Helianthus silphioides Nutt. | 19 images |
| Helianthus strumosus L. | 85 images |
| Helianthus tuberosus L. | 8672 images |
| Heliopsis helianthoides (L.) Sweet | 2886 images |
| Heliotropium curassavicum L. | 706 images |
| Heliotropium europaeum L. | 5683 images |
| Heliotropium indicum L. | 646 images |
| Helleborus viridis L. | 5437 images |
| Helminthotheca echioides (L.) Holub | 8510 images |
| Hemerocallis fulva (L.) L. | 11462 images |
| Hemerocallis lilioasphodelus L. | 6524 images |
| Hemionitis alabamensis (Buckley) Christenh. | 1 images |
| Hemionitis artax Christenh. | 1 images |
| Hemionitis atropurpurea (L.) Christenh. | 49 images |
| Hemionitis bradburyi (Hook.) Christenh. | 1 images |
| Hemionitis eatonii (Baker) Christenh. | 2 images |
| Hemionitis feei (T.Moore) Christenh. | 3 images |
| Hemionitis glabella (Mett.) Christenh. | 13 images |
| Hemionitis integerrima (Hook.) Christenh. | 1 images |
| Hemionitis lanosa (Michx.) Christenh. | 19 images |
| Hemionitis lindheimeri (Hook.) Christenh. | 4 images |
| Hemionitis sinuata (Lag.) Christenh. | 17 images |
| Hemionitis wrightiana (Hook.) Christenh. | 2 images |
| Hepatica acutiloba DC. | 14 images |
| Hepatica americana (DC.) Ker Gawl. | 7 images |
| Heracleum mantegazzianum Sommier & Levier | 3173 images |
| Heracleum maximum W.Bartram | 773 images |
| Hesperis matronalis L. | 8860 images |
| Heteranthera dubia (Jacq.) MacMill. | 24 images |
| Heteranthera limosa (Sw.) Willd. | 49 images |
| Heteranthera reniformis Ruiz & Pav. | 121 images |
| Heterotheca camporum (Greene) Shinners | 32 images |
| Heterotheca canescens (DC.) Shinners | 19 images |
| Heterotheca subaxillaris (Lam.) Britton & Rusby | 334 images |
| Heterotheca villosa (Pursh) Shinners | 188 images |
| Heuchera americana L. | 374 images |
| Heuchera richardsonii R.Br. | 51 images |
| Heuchera villosa Michx. | 275 images |
| Hexasepalum teres (Walter) J.H.Kirkbr. | 126 images |
| Hibiscus laevis All. | 124 images |
| Hibiscus moscheutos L. | 6068 images |
| Hibiscus syriacus L. | 29137 images |
| Hibiscus trionum L. | 1239 images |
| Hieracium albiflorum Hook. | 193 images |
| Hieracium lachenalii Suter | 628 images |
| Hieracium murorum L. | 4300 images |
| Hieracium sabaudum L. | 1105 images |
| Hieracium scabrum Michx. | 20 images |
| Hieracium umbellatum L. | 2313 images |
| Hieracium venosum L. | 163 images |
| Hippuris vulgaris L. | 563 images |
| Hoffmannseggia glauca (Ortega) Eifert | 108 images |
| Holcus lanatus L. | 6618 images |
| Holosteum umbellatum L. | 148 images |
| Homalosorus pycnocarpos (Spreng.) Pic.Serm. | 4 images |
| Hopia obtusa (Kunth) Zuloaga & Morrone | 1 images |
| Hordeum brachyantherum Nevski | 21 images |
| Hordeum jubatum L. | 568 images |
| Hordeum marinum Huds. | 318 images |
| Hordeum murinum L. | 7540 images |
| Hordeum pusillum Nutt. | 57 images |
| Hordeum vulgare L. | 9012 images |
| Hosta lancifolia (Thunb.) Engl. | 164 images |
| Hottonia inflata Elliott | 4 images |
| Houstonia caerulea L. | 552 images |
| Houstonia longifolia Gaertn. | 48 images |
| Houstonia micrantha (Shinners) Terrell | 42 images |
| Houstonia purpurea L. | 126 images |
| Houstonia pusilla Schoepf | 258 images |
| Houstonia rosea (Raf.) Terrell | 10 images |
| Hudsonia tomentosa Nutt. | 22 images |
| Humulus lupulus L. | 11008 images |
| Humulus scandens (Lour.) Merr. | 94 images |
| Huperzia selago (L.) Bernh. ex Schrank & Mart. | 490 images |
| Hybanthus concolor (T.F.Forst.) Spreng. | 1 images |
| Hydrangea arborescens L. | 6189 images |
| Hydrangea cinerea Small | 29 images |
| Hydrastis canadensis L. | 165 images |
| Hydrilla verticillata (L.f.) Royle | 6 images |
| Hydrocotyle americana L. | 53 images |
| Hydrocotyle ranunculoides L.f. | 249 images |
| Hydrocotyle umbellata L. | 63 images |
| Hydrocotyle verticillata Thunb. | 676 images |
| Hydrolea ovata Nutt. | 62 images |
| Hydrophyllum appendiculatum Michx. | 166 images |
| Hydrophyllum canadense L. | 22 images |
| Hydrophyllum macrophyllum Nutt. | 28 images |
| Hydrophyllum virginianum L. | 869 images |
| Hylodesmum glutinosum (Muhl. ex Willd.) H.Ohashi & R.R.Mill | 103 images |
| Hylodesmum nudiflorum (L.) H.Ohashi & R.R.Mill | 8 images |
| Hylotelephium erythrostictum (Miq.) H.Ohba | 28 images |
| Hylotelephium telephioides (Michx.) H.Ohba | 172 images |
| Hylotelephium telephium (L.) H.Ohba | 8809 images |
| Hymenocallis liriosme (Raf.) Shinners | 213 images |
| Hymenocallis occidentalis (Leconte) Kunth | 13 images |
| Hymenopappus filifolius Hook. | 55 images |
| Hymenopappus scabiosaeus L'Hér. | 9 images |
| Hymenopappus tenuifolius Pursh | 8 images |
| Hymenoxys odorata DC. | 14 images |
| Hymenoxys richardsonii (Hook.) Cockerell | 6 images |
| Hyoscyamus niger L. | 1569 images |
| Hypericum ascyron L. | 35 images |
| Hypericum canadense L. | 10 images |
| Hypericum crux-andreae (L.) Crantz | 6 images |
| Hypericum denticulatum Walter | 1 images |
| Hypericum ellipticum Hook. | 13 images |
| Hypericum fraseri (Spach) Steud. | 48 images |
| Hypericum gentianoides (L.) Britton, Sterns & Poggenb. | 37 images |
| Hypericum hypericoides (L.) Crantz | 297 images |
| Hypericum kalmianum L. | 204 images |
| Hypericum maculatum Crantz | 5082 images |
| Hypericum majus (A.Gray) Britton | 6 images |
| Hypericum mutilum L. | 121 images |
| Hypericum perforatum L. | 17826 images |
| Hypericum prolificum L. | 238 images |
| Hypericum punctatum Lam. | 279 images |
| Hypericum sphaerocarpum Michx. | 12 images |
| Hypericum virginicum L. | 26 images |
| Hypochaeris glabra L. | 3012 images |
| Hypochaeris radicata L. | 10578 images |
| Hypoxis hirsuta (L.) Coville | 327 images |
| Hyssopus officinalis L. | 2593 images |
| Ibervillea lindheimeri (A.Gray) Greene | 3 images |
| Ilex ambigua (Michx.) Torr. | 4 images |
| Ilex decidua Walter | 354 images |
| Ilex mucronata (L.) M.Powell, Savol. & S.Andrews | 140 images |
| Ilex opaca Aiton | 1513 images |
| Ilex verticillata (L.) A.Gray | 17 images |
| Ilex vomitoria Aiton | 836 images |
| Iliamna remota Greene | 1 images |
| Impatiens balfourii Hook.f. | 4994 images |
| Impatiens balsamina L. | 2674 images |
| Impatiens capensis Meerb. | 2758 images |
| Impatiens pallida Nutt. | 1125 images |
| Indigofera miniata Ortega | 79 images |
| Inula helenium L. | 3105 images |
| Iodanthus pinnatifidus (Michx.) Steud. | 56 images |
| Ionactis linariifolia (L.) Greene | 26 images |
| Ipomoea amnicola Morong | 14 images |
| Ipomoea coccinea L. | 32 images |
| Ipomoea cristulata Hallier f. | 54 images |
| Ipomoea hederacea Jacq. | 685 images |
| Ipomoea hederifolia L. | 794 images |
| Ipomoea lacunosa L. | 406 images |
| Ipomoea leptophylla Torr. | 45 images |
| Ipomoea purpurea (L.) Roth | 8352 images |
| Ipomoea quamoclit L. | 792 images |
| Ipomoea setosa Ker Gawl. | 14 images |
| Ipomoea shumardiana (Torr.) Shinners | 3 images |
| Ipomopsis aggregata (Pursh) V.E.Grant | 1 images |
| Ipomopsis congesta (Hook.) V.E.Grant | 42 images |
| Ipomopsis longiflora (Torr.) V.E.Grant | 5 images |
| Ipomopsis rubra (L.) Wherry | 155 images |
| Iresine rhizomatosa Standl. | 2 images |
| Iris × germanica L. | 7864 images |
| Iris brevicaulis Raf. | 19 images |
| Iris cristata Aiton | 192 images |
| Iris domestica (L.) Goldblatt & Mabb. | 1071 images |
| Iris fulva Ker Gawl. | 25 images |
| Iris lacustris Nutt. | 6 images |
| Iris missouriensis Nutt. | 121 images |
| Iris orientalis Mill. | 1327 images |
| Iris pallida Lam. | 2590 images |
| Iris pseudacorus L. | 10610 images |
| Iris pumila L. | 1632 images |
| Iris sibirica L. | 2661 images |
| Iris variegata L. | 696 images |
| Iris verna L. | 42 images |
| Iris versicolor L. | 936 images |
| Iris virginica L. | 141 images |
| Isatis tinctoria L. | 4032 images |
| Isoetes lacustris L. | 28 images |
| Isolepis cernua (Vahl) Roem. & Schult. | 125 images |
| Isolepis pseudosetacea (Daveau) Gand. | 6 images |
| Isotria medeoloides (Pursh) Raf. | 19 images |
| Itea virginica L. | 129 images |
| Iva annua L. | 142 images |
| Iva asperifolia Less. | 6 images |
| Iva axillaris Pursh | 6 images |
| Jacobaea vulgaris Gaertn. | 20350 images |
| Jacquemontia tamnifolia (L.) Griseb. | 177 images |
| Jeffersonia diphylla (L.) Pers. | 123 images |
| Juglans cinerea L. | 560 images |
| Juglans major (Torr.) A.Heller | 60 images |
| Juglans microcarpa Berland. | 12 images |
| Juglans nigra L. | 8650 images |
| Juncus alpinoarticulatus Chaix | 153 images |
| Juncus articulatus L. | 844 images |
| Juncus balticus Willd. | 31 images |
| Juncus brachycarpus Engelm. | 1 images |
| Juncus brachycephalus (Engelm.) Buchenau | 3 images |
| Juncus bufonius L. | 559 images |
| Juncus canadensis J.Gay ex Laharpe | 2 images |
| Juncus compressus Jacq. | 244 images |
| Juncus diffusissimus Buckley | 2 images |
| Juncus dudleyi Wiegand | 8 images |
| Juncus effusus L. | 4089 images |
| Juncus ensifolius Wikstr. | 99 images |
| Juncus filiformis L. | 117 images |
| Juncus gerardi Loisel. | 121 images |
| Juncus interior Wiegand | 3 images |
| Juncus marginatus Rostk. | 6 images |
| Juncus nodosus L. | 3 images |
| Juncus scirpoides Lam. | 3 images |
| Juncus squarrosus L. | 187 images |
| Juncus stygius L. | 10 images |
| Juncus tenuis Willd. | 761 images |
| Juncus torreyi Coville | 34 images |
| Juncus validus Coville | 2 images |
| Juniperus ashei J.Buchholz | 6 images |
| Juniperus communis L. | 9491 images |
| Juniperus horizontalis Moench | 2090 images |
| Juniperus monosperma (Engelm.) Sarg. | 57 images |
| Juniperus pinchotii Sudw. | 27 images |
| Juniperus scopulorum Sarg. | 630 images |
| Juniperus virginiana L. | 4823 images |
| Justicia lanceolata (Chapm.) Small | 4 images |
| Kallstroemia parviflora Norton | 2 images |
| Kalmia polifolia Wangenh. | 131 images |
| Kerria japonica (L.) DC. | 7924 images |
| Kickxia elatine (L.) Dumort. | 393 images |
| Kickxia spuria (L.) Dumort. | 917 images |
| Knautia arvensis (L.) Coult. | 16612 images |
| Koeleria macrantha (Ledeb.) Schult. | 141 images |
| Koeleria spicata (L.) Barberá, Quintanar, Soreng & P.M.Peterson | 87 images |
| Koelreuteria paniculata Laxm. | 10288 images |
| Krameria lanceolata Torr. | 46 images |
| Krascheninnikovia lanata (Pursh) A.Meeuse & A.Smit | 1 images |
| Krigia biflora (Walter) S.F.Blake | 63 images |
| Krigia dandelion Nutt. | 59 images |
| Krigia occidentalis Nutt. | 6 images |
| Krigia virginica (L.) Willd. | 84 images |
| Kummerowia stipulacea (Maxim.) Makino | 4 images |
| Kummerowia striata (Thunb.) Schindl. | 186 images |
| Lactuca biennis (Moench) Fernald | 170 images |
| Lactuca canadensis L. | 497 images |
| Lactuca floridana (L.) Gaertn. | 698 images |
| Lactuca hirsuta Muhl. ex Nutt. | 24 images |
| Lactuca muralis (L.) E.Mey. | 765 images |
| Lactuca saligna L. | 461 images |
| Lactuca sativa L. | 5180 images |
| Lactuca serriola L. | 14014 images |
| Lagenaria siceraria (Molina) Standl. | 969 images |
| Lagerstroemia indica L. | 17547 images |
| Lamium album L. | 8548 images |
| Lamium amplexicaule L. | 5323 images |
| Lamium galeobdolon (L.) L. | 14068 images |
| Lamium hybridum Vill. | 8356 images |
| Lamium maculatum (L.) L. | 11715 images |
| Lamium purpureum L. | 16457 images |
| Laportea canadensis (L.) Wedd. | 333 images |
| Lappula occidentalis (S.Watson) Greene | 6 images |
| Lappula squarrosa (Retz.) Dumort. | 257 images |
| Lapsana communis L. | 15483 images |
| Larix decidua Mill. | 6972 images |
| Larix laricina (Du Roi) K.Koch | 251 images |
| Lathyrus hirsutus L. | 704 images |
| Lathyrus japonicus Willd. | 732 images |
| Lathyrus latifolius L. | 11031 images |
| Lathyrus ochroleucus Hook. | 38 images |
| Lathyrus odoratus L. | 4571 images |
| Lathyrus oleraceus Lam. | 5407 images |
| Lathyrus palustris L. | 243 images |
| Lathyrus pratensis L. | 5474 images |
| Lathyrus sylvestris L. | 3141 images |
| Lathyrus tuberosus L. | 2452 images |
| Lathyrus venosus Muhl. ex Willd. | 20 images |
| Leavenworthia uniflora (Michx.) Britton | 3 images |
| Lechea minor L. | 2 images |
| Lechea mucronata Raf. | 10 images |
| Lechea racemulosa Michx. | 2 images |
| Leersia lenticularis Michx. | 1 images |
| Leersia oryzoides (L.) Sw. | 293 images |
| Leersia virginica Willd. | 59 images |
| Leitneria floridana Chapm. | 7 images |
| Lemna aequinoctialis Welw. | 66 images |
| Lemna gibba L. | 77 images |
| Lemna minor L. | 1075 images |
| Lemna minuta Kunth | 116 images |
| Lemna trisulca L. | 124 images |
| Lemna turionifera Landolt | 22 images |
| Lemna valdiviana Phil. | 7 images |
| Leontodon hispidus L. | 3799 images |
| Leontodon saxatilis Lam. | 1525 images |
| Leonurus cardiaca L. | 4000 images |
| Leonurus japonicus Houtt. | 29 images |
| Leonurus sibiricus L. | 313 images |
| Lepidium austrinum Small | 10 images |
| Lepidium campestre (L.) W.T.Aiton | 30 images |
| Lepidium coronopus (L.) Al-Shehbaz | 159 images |
| Lepidium densiflorum Schrad. | 70 images |
| Lepidium didymum L. | 1636 images |
| Lepidium draba L. | 8283 images |
| Lepidium latifolium L. | 888 images |
| Lepidium oblongum Small | 10 images |
| Lepidium perfoliatum L. | 40 images |
| Lepidium ruderale L. | 267 images |
| Lepidium sativum L. | 963 images |
| Lepidium virginicum L. | 2053 images |
| Leptochloa panicea (Retz.) Ohwi | 5 images |
| Lespedeza bicolor Turcz. | 571 images |
| Lespedeza capitata Michx. | 144 images |
| Lespedeza cuneata (Dum.Cours.) G.Don | 169 images |
| Lespedeza hirta (L.) Hornem. | 78 images |
| Lespedeza procumbens Michx. | 22 images |
| Lespedeza stuevei Nutt. | 6 images |
| Lespedeza thunbergii (DC.) Nakai | 328 images |
| Lespedeza violacea Pers. | 35 images |
| Lespedeza virginica (L.) Britton | 139 images |
| Leucanthemella serotina (L.) Tzvelev | 141 images |
| Leucanthemum vulgare Lam. | 11198 images |
| Leucocrinum montanum Nutt. ex A.Gray | 78 images |
| Leucojum aestivum L. | 2249 images |
| Leucospora multifida (Michx.) Nutt. | 32 images |
| Leuzea repens (L.) D.J.N.Hind | 34 images |
| Levisticum officinale W.D.J.Koch | 1772 images |
| Leymus arenarius (L.) Hochst. | 1350 images |
| Leymus cinereus (Scribn. & Merr.) Á.Löve | 3 images |
| Leymus innovatus (Beal) Pilg. | 1 images |
| Leymus mollis (Trin.) Pilg. | 7 images |
| Leymus racemosus (Lam.) Tzvelev | 17 images |
| Liatris aspera Michx. | 239 images |
| Liatris cylindracea Michx. | 38 images |
| Liatris elegans (Walter) Michx. | 21 images |
| Liatris ligulistylis (A.Nelson) K.Schum. | 2 images |
| Liatris punctata Hook. | 208 images |
| Liatris pycnostachya Michx. | 756 images |
| Liatris scariosa (L.) Willd. | 34 images |
| Liatris spicata (L.) Willd. | 2632 images |
| Liatris squarrosa (L.) Michx. | 74 images |
| Liatris squarrulosa Michx. | 9 images |
| Ligusticum canadense (L.) Britton | 16 images |
| Ligustrum obtusifolium Siebold & Zucc. | 221 images |
| Ligustrum quihoui Carrière | 24 images |
| Ligustrum vulgare L. | 20746 images |
| Lilium lancifolium Thunb. | 1957 images |
| Lilium michiganense Farw. | 89 images |
| Lilium philadelphicum L. | 121 images |
| Lilium superbum L. | 104 images |
| Limnosciadium pinnatum (DC.) Mathias & Constance | 14 images |
| Limosella aquatica L. | 69 images |
| Linaria dalmatica (L.) Mill. | 224 images |
| Linaria genistifolia (L.) Mill. | 294 images |
| Linaria vulgaris Mill. | 19028 images |
| Lindera benzoin (L.) Blume | 999 images |
| Lindernia dubia (L.) Pennell | 239 images |
| Lindheimera texana A.Gray & Engelm. | 44 images |
| Linnaea borealis L. | 747 images |
| Linum grandiflorum Desf. | 3073 images |
| Linum imbricatum (Raf.) B.D.Jacks. | 1 images |
| Linum lewisii Pursh | 181 images |
| Linum medium (Planch.) Britton | 24 images |
| Linum perenne L. | 3199 images |
| Linum pratense (Norton) Small | 36 images |
| Linum puberulum (Engelm.) A.Heller | 17 images |
| Linum rigidum Pursh | 18 images |
| Linum sulcatum Riddell | 4 images |
| Linum usitatissimum L. | 5926 images |
| Linum virginianum L. | 1 images |
| Lipandra polysperma (L.) S.Fuentes, Uotila & Borsch | 1283 images |
| Liparis liliifolia (L.) Rich. ex Lindl. | 12 images |
| Liparis loeselii (L.) Rich. | 196 images |
| Liquidambar styraciflua L. | 12601 images |
| Liriodendron tulipifera L. | 10862 images |
| Liriope spicata Lour. | 69 images |
| Lithophragma glabrum Nutt. | 53 images |
| Lithophragma parviflorum (Hook.) Nutt. | 3 images |
| Lithospermum canescens (Michx.) Lehm. | 153 images |
| Lithospermum incisum Lehm. | 141 images |
| Lithospermum latifolium Michx. | 9 images |
| Lithospermum molle (Michx.) Muhl. | 9 images |
| Lithospermum multiflorum Torr. ex A.Gray | 12 images |
| Lithospermum officinale L. | 1753 images |
| Lithospermum parviflorum Weakley, Witsell & D.Estes | 2 images |
| Lobelia × speciosa Sweet | 50 images |
| Lobelia cardinalis L. | 2252 images |
| Lobelia dortmanna L. | 173 images |
| Lobelia inflata L. | 646 images |
| Lobelia kalmii L. | 65 images |
| Lobelia nuttallii Schult. | 1 images |
| Lobelia puberula Michx. | 113 images |
| Lobelia siphilitica L. | 1430 images |
| Lobelia spicata Lam. | 134 images |
| Lobularia maritima (L.) Desv. | 14127 images |
| Loeflingia squarrosa Nutt. | 2 images |
| Lolium arundinaceum (Schreb.) Darbysh. | 943 images |
| Lolium multiflorum Lam. | 417 images |
| Lolium perenne L. | 3513 images |
| Lolium pratense (Huds.) Darbysh. | 811 images |
| Lolium rigidum Gaudin | 217 images |
| Lolium temulentum L. | 32 images |
| Lomatium cous (S.Watson) J.M.Coult. & Rose | 17 images |
| Lomatium foeniculaceum (Nutt.) J.M.Coult. & Rose | 7 images |
| Lonicera canadensis J.Bartram & W.Bartram ex Marshall | 140 images |
| Lonicera dioica L. | 123 images |
| Lonicera flava Sims | 41 images |
| Lonicera fragrantissima Lindl. & Paxton | 2078 images |
| Lonicera hirsuta Eaton | 26 images |
| Lonicera involucrata (Richardson) Banks ex Spreng. | 888 images |
| Lonicera japonica Thunb. | 10989 images |
| Lonicera maackii (Rupr.) Maxim. | 2693 images |
| Lonicera oblongifolia Hook. | 4 images |
| Lonicera reticulata Raf. | 20 images |
| Lonicera ruprechtiana Regel | 3 images |
| Lonicera sempervirens L. | 1653 images |
| Lonicera tatarica L. | 5701 images |
| Lonicera villosa (Michx.) Schult. | 3 images |
| Lonicera xylosteum L. | 11006 images |
| Lotus corniculatus L. | 20157 images |
| Ludwigia alternifolia L. | 223 images |
| Ludwigia decurrens Walter | 48 images |
| Ludwigia glandulosa Walter | 4 images |
| Ludwigia grandiflora (Michx.) Greuter & Burdet | 1361 images |
| Ludwigia leptocarpa (Nutt.) H.Hara | 7 images |
| Ludwigia linearis Walter | 9 images |
| Ludwigia palustris (L.) Elliott | 322 images |
| Ludwigia peploides (Kunth) P.H.Raven | 805 images |
| Ludwigia repens J.R.Forst. | 8 images |
| Ludwigia sphaerocarpa Elliott | 1 images |
| Luffa aegyptiaca Mill. | 68 images |
| Lunaria annua L. | 21209 images |
| Lupinus argenteus Pursh | 133 images |
| Lupinus perennis L. | 1058 images |
| Lupinus polyphyllus Lindl. | 9025 images |
| Lupinus pusillus Pursh | 14 images |
| Lupinus sericeus Pursh | 49 images |
| Luzula acuminata Raf. | 15 images |
| Luzula luzuloides (Lam.) Dandy & Wilmott | 606 images |
| Luzula multiflora (Ehrh.) Lej. | 382 images |
| Luzula parviflora (Ehrh.) Desv. | 4 images |
| Lycium barbarum L. | 3327 images |
| Lycium chinense Mill. | 201 images |
| Lycopodiella appressa (Chapm.) Cranfill | 3 images |
| Lycopodiella inundata (L.) Holub | 158 images |
| Lycopodium × zeilleri (Rouy) Greuter & Burdet | 59 images |
| Lycopodium annotinum L. | 1075 images |
| Lycopodium clavatum L. | 816 images |
| Lycopodium complanatum L. | 265 images |
| Lycopodium dendroideum Michx. | 232 images |
| Lycopodium digitatum Dill. ex A.Braun | 33 images |
| Lycopodium obscurum L. | 2 images |
| Lycopodium tristachyum Pursh | 98 images |
| Lycopus americanus Muhl. ex W.P.C.Barton | 8 images |
| Lycopus asper Greene | 11 images |
| Lycopus europaeus L. | 6551 images |
| Lycopus rubellus Moench | 8 images |
| Lycopus uniflorus Michx. | 158 images |
| Lycopus virginicus L. | 41 images |
| Lycoris radiata (L'Hér.) Herb. | 425 images |
| Lygodesmia juncea (Pursh) D.Don ex Hook. | 1 images |
| Lygodesmia texana (Torr. & A.Gray) Greene ex Small | 2 images |
| Lygodium japonicum (Thunb.) Sw. | 141 images |
| Lyonia ligustrina (L.) DC. | 13 images |
| Lyonia mariana (L.) D.Don | 8 images |
| Lysimachia arvensis (L.) U.Manns & Anderb. | 11370 images |
| Lysimachia borealis (Raf.) U.Manns & Anderb. | 635 images |
| Lysimachia ciliata L. | 1017 images |
| Lysimachia clethroides Duby | 1276 images |
| Lysimachia foemina (Mill.) U.Manns & Anderb. | 2519 images |
| Lysimachia hybrida Michx. | 1 images |
| Lysimachia lanceolata Walter | 30 images |
| Lysimachia maritima (L.) Galasso, Banfi & Soldano | 448 images |
| Lysimachia minima (L.) U.Manns & Anderb. | 18 images |
| Lysimachia nummularia L. | 4956 images |
| Lysimachia punctata L. | 10366 images |
| Lysimachia quadriflora Sims | 12 images |
| Lysimachia quadrifolia L. | 210 images |
| Lysimachia terrestris (L.) Britton, Sterns & Poggenb. | 37 images |
| Lysimachia thyrsiflora L. | 375 images |
| Lysimachia vulgaris L. | 9575 images |
| Lythrum alatum Pursh | 63 images |
| Lythrum hyssopifolia L. | 574 images |
| Lythrum salicaria L. | 26278 images |
| Lythrum virgatum L. | 3996 images |
| Machaeranthera tanacetifolia (Kunth) Nees | 135 images |
| Macleaya cordata (Willd.) R.Br. | 1058 images |
| Maclura pomifera (Raf.) C.K.Schneid. | 4478 images |
| Madia glomerata Hook. | 6 images |
| Magnolia acuminata (L.) L. | 954 images |
| Magnolia macrophylla Michx. | 559 images |
| Magnolia stellata (Siebold & Zucc.) Maxim. | 4369 images |
| Magnolia tripetala (L.) L. | 476 images |
| Maianthemum canadense Desf. | 1134 images |
| Maianthemum racemosum (L.) Link | 1648 images |
| Maianthemum stellatum (L.) Link | 601 images |
| Maianthemum trifolium (L.) Sloboda | 29 images |
| Malaxis monophyllos (L.) Sw. | 54 images |
| Malaxis unifolia Michx. | 17 images |
| Malus angustifolia (Aiton) Michx. | 30 images |
| Malus baccata (L.) Borkh. | 3055 images |
| Malus coronaria (L.) Mill. | 122 images |
| Malus domestica (Suckow) Borkh. | 8737 images |
| Malus hupehensis (Pamp.) Rehder | 2111 images |
| Malus ioensis (Alph.Wood) Britton | 22 images |
| Malus prunifolia (Willd.) Borkh. | 257 images |
| Malus toringo (Siebold) de Vriese | 143 images |
| Malva alcea L. | 14055 images |
| Malva moschata L. | 5935 images |
| Malva neglecta Wallr. | 6026 images |
| Malva parviflora L. | 3042 images |
| Malva pusilla Sm. | 1615 images |
| Malva sylvestris L. | 27398 images |
| Malva thuringiaca (L.) Vis. | 839 images |
| Malva trimestris (L.) Salisb. | 3514 images |
| Malva verticillata L. | 263 images |
| Malvastrum hispidum (Pursh) Hochr. | 6 images |
| Malvella leprosa (Ortega) Krapov. | 120 images |
| Mammillaria heyderi Muehlenpf. | 36 images |
| Marrubium vulgare L. | 4596 images |
| Marshallia caespitosa Nutt. ex DC. | 20 images |
| Marsilea quadrifolia L. | 298 images |
| Matelea biflora (Raf.) Woodson | 46 images |
| Matelea decipiens (Alexander) Woodson | 10 images |
| Matelea obliqua (Jacq.) Woodson | 6 images |
| Matricaria chamomilla L. | 10429 images |
| Matricaria discoidea DC. | 3923 images |
| Matthiola incana (L.) W.T.Aiton | 209 images |
| Mazus miquelii Makino | 24 images |
| Mazus pumilus (Burm.f.) Steenis | 276 images |
| Mecardonia acuminata (Walter) Small | 7 images |
| Medeola virginiana L. | 359 images |
| Medicago × varia Martyn | 833 images |
| Medicago arabica (L.) Huds. | 3565 images |
| Medicago falcata L. | 1791 images |
| Medicago lupulina L. | 7942 images |
| Medicago minima (L.) Bartal. | 50 images |
| Medicago orbicularis (L.) Bartal. | 804 images |
| Medicago sativa L. | 17707 images |
| Megathyrsus maximus (Jacq.) B.K.Simon & S.W.L.Jacobs | 234 images |
| Melampodium leucanthum Torr. & A.Gray | 74 images |
| Melampyrum lineare Lam. | 182 images |
| Melanthera nivea (L.) Small | 107 images |
| Melanthium virginicum L. | 9 images |
| Melia azedarach L. | 11832 images |
| Melica altissima L. | 57 images |
| Melica mutica Walter | 21 images |
| Melica nitens (Scribn.) Nutt. ex Piper | 3 images |
| Melica porteri Scribn. | 1 images |
| Melica subulata (Griseb.) Scribn. | 2 images |
| Melilotus albus Medik. | 8368 images |
| Melilotus altissimus Thuill. | 562 images |
| Melilotus indicus (L.) All. | 2416 images |
| Melilotus officinalis (L.) Lam. | 4724 images |
| Melissa officinalis L. | 14917 images |
| Melochia corchorifolia L. | 106 images |
| Melothria pendula L. | 561 images |
| Menispermum canadense L. | 298 images |
| Mentha × dumetorum Schult. | 1 images |
| Mentha × gracilis Sole | 12 images |
| Mentha × piperita L. | 3720 images |
| Mentha × rotundifolia (L.) Huds. | 1573 images |
| Mentha × verticillata L. | 48 images |
| Mentha × villosa Huds. | 524 images |
| Mentha aquatica L. | 8280 images |
| Mentha arvensis L. | 3505 images |
| Mentha canadensis L. | 14 images |
| Mentha longifolia (L.) L. | 3068 images |
| Mentha spicata L. | 9362 images |
| Mentha suaveolens Ehrh. | 11539 images |
| Mentzelia decapetala (Sims) Urb. | 14 images |
| Mentzelia dispersa S.Watson | 2 images |
| Mentzelia multiflora (Nutt.) A.Gray | 72 images |
| Mentzelia oligosperma Nutt. ex Sims | 1 images |
| Menyanthes trifoliata L. | 2014 images |
| Mertensia lanceolata (Pursh) DC. | 26 images |
| Mertensia oblongifolia (Nutt.) G.Don | 26 images |
| Mertensia paniculata (Aiton) G.Don | 81 images |
| Mertensia virginica (L.) Pers. ex Link | 933 images |
| Micranthes pensylvanica (L.) Haw. | 43 images |
| Micranthes texana (Buckley) Small | 10 images |
| Micranthes virginiensis (Michx.) Small | 107 images |
| Microseris cuspidata (Pursh) Sch.Bip. | 15 images |
| Microseris nutans (Hook.) Sch.Bip. | 7 images |
| Microstegium vimineum (Trin.) A.Camus | 148 images |
| Microsteris gracilis (Hook.) Greene | 23 images |
| Mikania scandens (L.) Willd. | 322 images |
| Milium effusum L. | 407 images |
| Mimosa quadrivalvis L. | 312 images |
| Mimosa strigillosa Torr. & A.Gray | 5 images |
| Mimulus alatus Aiton | 124 images |
| Mimulus ringens L. | 525 images |
| Mirabilis albida (Walter) Heimerl | 52 images |
| Mirabilis gigantea (Standl.) Shinners | 3 images |
| Mirabilis jalapa L. | 17365 images |
| Mirabilis linearis (Pursh) Heimerl | 17 images |
| Mirabilis nyctaginea (Michx.) MacMill. | 281 images |
| Miscanthus floridulus (Labill.) Warb. ex K.Schum. & Lauterb. | 10 images |
| Miscanthus sacchariflorus (Maxim.) Benth. & Hook.f. ex Franch. | 54 images |
| Miscanthus sinensis Andersson | 4210 images |
| Misopates orontium (L.) Raf. | 1939 images |
| Mitchella repens L. | 1024 images |
| Mitella diphylla L. | 134 images |
| Mitella nuda L. | 16 images |
| Mitreola petiolata (J.F.Gmel.) Torr. & A.Gray | 2 images |
| Modiola caroliniana (L.) G.Don | 254 images |
| Moehringia lateriflora (L.) Fenzl | 43 images |
| Moehringia macrophylla (Hook.) Fenzl | 30 images |
| Moenchia erecta (L.) G.Gaertn., B.Mey. & Scherb. | 58 images |
| Molinia caerulea (L.) Moench | 1384 images |
| Mollugo verticillata L. | 371 images |
| Moluccella laevis L. | 317 images |
| Momordica balsamina L. | 262 images |
| Monarda bradburiana Beck | 25 images |
| Monarda citriodora Cerv. ex Lag. | 422 images |
| Monarda clinopodia L. | 97 images |
| Monarda clinopodioides A.Gray | 1 images |
| Monarda didyma L. | 3721 images |
| Monarda fistulosa L. | 2798 images |
| Monarda media Willd. | 18 images |
| Monarda pectinata Nutt. | 16 images |
| Monarda punctata L. | 453 images |
| Monarda russeliana Nutt. ex Sims | 18 images |
| Moneses uniflora (L.) A.Gray | 408 images |
| Mononeuria minima (Mack.) Dillenb. & Kadereit | 1 images |
| Mononeuria nuttallii (Torr. & A.Gray) Dillenb. & Kadereit | 4 images |
| Mononeuria patula (Michx.) Dillenb. & Kadereit | 27 images |
| Monotropa hypopitys L. | 1314 images |
| Monotropa uniflora L. | 1236 images |
| Montia chamissoi (Ledeb. ex Spreng.) Greene | 6 images |
| Moorochloa eruciformis (Sm.) Veldkamp | 12 images |
| Morus alba L. | 12281 images |
| Morus microphylla Buckley | 1 images |
| Morus rubra L. | 3764 images |
| Muhlenbergia capillaris (Lam.) Trin. | 302 images |
| Muhlenbergia frondosa (Poir.) Fernald | 8 images |
| Muhlenbergia glabrifloris Scribn. | 1 images |
| Muhlenbergia glomerata (Willd.) Trin. | 1 images |
| Muhlenbergia mexicana (L.) Trin. | 11 images |
| Muhlenbergia porteri Scribn. | 10 images |
| Muhlenbergia pungens Thurb. | 1 images |
| Muhlenbergia reverchonii Vasey & Scribn. | 4 images |
| Muhlenbergia schreberi J.F.Gmel. | 13 images |
| Muhlenbergia torreyi (Kunth) Hitchc. ex Bush | 2 images |
| Mummenhoffia alliacea (L.) Esmailbegi & Al-Shehbaz | 263 images |
| Muscari armeniacum H.J.Veitch | 33 images |
| Muscari botryoides (L.) Mill. | 5626 images |
| Muscari comosum (L.) Mill. | 11365 images |
| Muscari neglectum Guss. ex Ten. | 10852 images |
| Muscarimia muscari (L.) Losinsk. | 3 images |
| Myosotis arvensis (L.) Hill | 3519 images |
| Myosotis discolor Pers. | 883 images |
| Myosotis laxa Lehm. | 346 images |
| Myosotis macrosperma Engelm. | 91 images |
| Myosotis scorpioides L. | 6324 images |
| Myosotis stricta Link ex Roem. & Schult. | 739 images |
| Myosotis sylvatica Ehrh. ex Hoffm. | 576 images |
| Myosotis verna Nutt. | 13 images |
| Myrica cerifera L. | 664 images |
| Myrica gale L. | 799 images |
| Myriophyllum alterniflorum DC. | 58 images |
| Myriophyllum aquaticum (Vell.) Verdc. | 641 images |
| Myriophyllum heterophyllum Michx. | 10 images |
| Myriophyllum sibiricum Kom. | 8 images |
| Myriophyllum spicatum L. | 396 images |
| Myriophyllum verticillatum L. | 79 images |
| Nabalus albus (L.) Hook. | 226 images |
| Nabalus altissimus (L.) Hook. | 11 images |
| Najas gracillima (A.Braun ex Engelm.) Magnus | 1 images |
| Najas guadalupensis (Spreng.) Magnus | 15 images |
| Najas marina L. | 156 images |
| Najas minor All. | 27 images |
| Nama hispida A.Gray | 1 images |
| Napaea dioica L. | 34 images |
| Narcissus × incomparabilis Mill. | 85 images |
| Narcissus × medioluteus Mill. | 578 images |
| Narcissus jonquilla L. | 2084 images |
| Narcissus poeticus L. | 3120 images |
| Narcissus pseudonarcissus L. | 9563 images |
| Nassella leucotricha (Trin. & Rupr.) R.W.Pohl | 1 images |
| Nassella trichotoma (Nees) Hack. & Arechav. | 13 images |
| Nassella viridula (Trin.) Barkworth | 1 images |
| Nasturtium microphyllum (Boenn.) Rchb. | 76 images |
| Nasturtium officinale W.T.Aiton | 907 images |
| Navarretia intertexta (Benth.) Hook. | 27 images |
| Nekemias arborea (L.) J.Wen & Boggan | 1 images |
| Nelumbo lutea (Willd.) Pers. | 6 images |
| Nelumbo nucifera Gaertn. | 2265 images |
| Nemastylis geminiflora Nutt. | 42 images |
| Nemophila aphylla (L.) Brummitt | 30 images |
| Nemophila phacelioides W.P.C.Barton | 107 images |
| Neottia auriculata (Wiegand) Szlach. | 1 images |
| Neottia bifolia (Raf.) Baumbach | 1 images |
| Neottia convallarioides (Sw.) Rich. | 4 images |
| Neottia cordata (L.) Rich. | 219 images |
| Nepeta cataria L. | 4228 images |
| Neptunia lutea (Leavenw.) Benth. | 17 images |
| Neslia paniculata (L.) Desv. | 86 images |
| Nicandra physalodes (L.) Gaertn. | 3335 images |
| Nicotiana longiflora Cav. | 84 images |
| Nicotiana obtusifolia M.Martens & Galeotti | 1 images |
| Nicotiana rustica L. | 423 images |
| Nigella damascena L. | 14215 images |
| Noccaea perfoliata (L.) Al-Shehbaz | 1254 images |
| Nothoscordum bivalve (L.) Britton | 631 images |
| Nuphar advena (Aiton) W.T.Aiton | 3 images |
| Nuphar microphylla (Pers.) Fernald | 1 images |
| Nuphar variegata Engelm. ex Durand | 1 images |
| Nuttallanthus canadensis (L.) D.A.Sutton | 31 images |
| Nuttallanthus texanus (Scheele) D.A.Sutton | 1 images |
| Nymphaea mexicana Zucc. | 227 images |
| Nymphaea odorata Aiton | 471 images |
| Nymphoides peltata (S.G.Gmel.) Kuntze | 539 images |
| Nyssa aquatica L. | 60 images |
| Nyssa biflora Walter | 10 images |
| Nyssa sylvatica Marshall | 1238 images |
| Obolaria virginica L. | 66 images |
| Ocimum basilicum L. | 9897 images |
| Odontites vulgaris Moench | 23 images |
| Oenanthe javanica (Blume) DC. | 61 images |
| Oenothera albicaulis Pursh | 65 images |
| Oenothera biennis L. | 15689 images |
| Oenothera cespitosa Nutt. | 54 images |
| Oenothera curtiflora W.L.Wagner & Hoch | 4 images |
| Oenothera elata Kunth | 197 images |
| Oenothera filiformis (Small) W.L.Wagner & Hoch | 4 images |
| Oenothera filipes (Spach) W.L.Wagner & Hoch | 9 images |
| Oenothera flava (A.Nelson) Garrett | 41 images |
| Oenothera fruticosa L. | 1933 images |
| Oenothera gaura W.L.Wagner & Hoch | 2935 images |
| Oenothera glazioviana Micheli | 9119 images |
| Oenothera grandis Smyth | 2 images |
| Oenothera hartwegii Benth. | 103 images |
| Oenothera howardii (A.Nelson) M.E.Jones ex Prain | 19 images |
| Oenothera laciniata Hill | 604 images |
| Oenothera lavandulifolia Torr. & A.Gray | 3 images |
| Oenothera linifolia Nutt. | 14 images |
| Oenothera macrocarpa Nutt. | 769 images |
| Oenothera nuttallii Torr. & A.Gray | 2 images |
| Oenothera oakesiana (A.Gray) J.W.Robbins ex S.Watson | 6 images |
| Oenothera pallida Lindl. | 41 images |
| Oenothera parviflora L. | 3164 images |
| Oenothera perennis L. | 12 images |
| Oenothera pilosella Raf. | 42 images |
| Oenothera rhombipetala Nutt. | 12 images |
| Oenothera speciosa Nutt. | 3446 images |
| Oenothera suffrutescens (Moc. & Sessé ex Ser.) W.L.Wagner & Hoch | 106 images |
| Oenothera suffulta (Engelm.) W.L.Wagner & Hoch | 10 images |
| Oenothera tetragona Roth | 22 images |
| Oenothera triloba Nutt. | 85 images |
| Oenothera villosa Thunb. | 112 images |
| Omalotheca sylvatica (L.) Sch.Bip. & F.W.Schultz | 659 images |
| Onobrychis viciifolia Scop. | 7946 images |
| Onoclea sensibilis L. | 1831 images |
| Ononis spinosa L. | 5235 images |
| Onopordum acanthium L. | 5601 images |
| Ophioglossum crotalophoroides Walter | 4 images |
| Ophioglossum engelmannii Prantl | 12 images |
| Ophioglossum petiolatum Hook. | 10 images |
| Ophioglossum pusillum Raf. | 4 images |
| Ophioglossum vulgatum L. | 374 images |
| Oplismenus compositus (L.) P.Beauv. | 47 images |
| Opuntia camanchica Engelm. & J.M.Bigelow | 2 images |
| Opuntia cespitosa Raf. | 1 images |
| Opuntia fragilis (Nutt.) Haw. | 177 images |
| Opuntia macrorhiza Engelm. | 81 images |
| Opuntia orbiculata Salm-Dyck ex Pfeiff. | 87 images |
| Opuntia phaeacantha Engelm. | 596 images |
| Opuntia polyacantha Haw. | 546 images |
| Orbexilum onobrychis (Nutt.) Rydb. | 4 images |
| Oreocarya suffruticosa (Torr.) Greene | 1 images |
| Oreocarya thyrsiflora Greene | 5 images |
| Origanum vulgare L. | 22290 images |
| Ornithogalum nutans L. | 1276 images |
| Ornithogalum umbellatum L. | 8663 images |
| Orobanche fasciculata Nutt. | 139 images |
| Orobanche ludoviciana Nutt. | 11 images |
| Orobanche ramosa L. | 480 images |
| Orobanche uniflora L. | 117 images |
| Orthilia secunda (L.) House | 589 images |
| Orthocarpus luteus Nutt. | 5 images |
| Oryza sativa L. | 521 images |
| Oryzopsis asperifolia Michx. | 4 images |
| Osmorhiza berteroi DC. | 9 images |
| Osmorhiza claytonii (Michx.) C.B.Clarke | 25 images |
| Osmorhiza depauperata Phil. | 7 images |
| Osmorhiza longistylis (Torr.) DC. | 384 images |
| Osmunda claytoniana L. | 458 images |
| Osmunda spectabilis Willd. | 5 images |
| Osmundastrum cinnamomeum (L.) C.Presl | 209 images |
| Ostrya virginiana (Mill.) K.Koch | 431 images |
| Oxalis articulata Savigny | 5676 images |
| Oxalis corniculata L. | 10015 images |
| Oxalis dillenii Jacq. | 2762 images |
| Oxalis montana Raf. | 67 images |
| Oxalis stricta L. | 2908 images |
| Oxalis violacea L. | 616 images |
| Oxybasis chenopodioides (L.) S.Fuentes, Uotila & Borsch | 75 images |
| Oxybasis glauca (L.) S.Fuentes, Uotila & Borsch | 296 images |
| Oxybasis rubra (L.) S.Fuentes, Uotila & Borsch | 696 images |
| Oxybasis urbica (L.) S.Fuentes, Uotila & Borsch | 44 images |
| Oxydendrum arboreum (L.) DC. | 458 images |
| Oxypolis rigidior (L.) Raf. | 23 images |
| Oxyria digyna (L.) Hill | 467 images |
| Oxytropis campestris (L.) DC. | 659 images |
| Oxytropis deflexa (Pall.) DC. | 14 images |
| Oxytropis lambertii Pursh | 69 images |
| Oxytropis splendens Douglas | 26 images |
| Pachysandra procumbens Michx. | 53 images |
| Pachysandra terminalis Siebold & Zucc. | 1770 images |
| Packera aurea (L.) Á.Löve & D.Löve | 204 images |
| Packera cana (Hook.) W.A.Weber & Á.Löve | 2 images |
| Packera dubia (Spreng.) Trock & Mabb. | 12 images |
| Packera glabella (Poir.) C.Jeffrey | 272 images |
| Packera paupercula (Michx.) Á.Löve & D.Löve | 2 images |
| Packera plattensis (Nutt.) W.A.Weber & Á.Löve | 1 images |
| Palafoxia callosa (Nutt.) Torr. & A.Gray | 1 images |
| Palafoxia rosea (Bush) Cory | 16 images |
| Palafoxia sphacelata (Nutt. ex Torr.) Cory | 12 images |
| Palustricodon aparinoides (Pursh) Morin | 20 images |
| Panax quinquefolius L. | 130 images |
| Panax trifolius L. | 147 images |
| Pancratium maritimum L. | 5797 images |
| Panicum capillare L. | 827 images |
| Panicum dichotomiflorum Michx. | 98 images |
| Panicum miliaceum L. | 1425 images |
| Panicum virgatum L. | 1164 images |
| Papaver dubium L. | 4357 images |
| Papaver orientale L. | 4986 images |
| Papaver rhoeas L. | 12624 images |
| Papaver somniferum L. | 11553 images |
| Parentucellia viscosa (L.) Caruel | 1107 images |
| Parietaria pensylvanica Muhl. ex Willd. | 233 images |
| Parnassia glauca Raf. | 38 images |
| Parnassia grandifolia DC. | 8 images |
| Parnassia palustris L. | 5049 images |
| Paronychia fastigiata (Raf.) Fernald | 7 images |
| Paronychia sessiliflora Nutt. | 4 images |
| Paronychia virginica Spreng. | 12 images |
| Parthenium hysterophorus L. | 1213 images |
| Parthenium integrifolium L. | 227 images |
| Parthenocissus quinquefolia (L.) Planch. | 18194 images |
| Parthenocissus tricuspidata (Siebold & Zucc.) Planch. | 4553 images |
| Parthenocissus vitacea (Knerr) Hitchc. | 3 images |
| Paspalum bifidum (Bertol.) Nash | 7 images |
| Paspalum dilatatum Poir. | 1421 images |
| Paspalum distichum L. | 287 images |
| Paspalum floridanum Michx. | 5 images |
| Paspalum notatum Flüggé | 55 images |
| Paspalum repens P.J.Bergius | 168 images |
| Paspalum setaceum Michx. | 13 images |
| Paspalum urvillei Steud. | 109 images |
| Passiflora incarnata L. | 755 images |
| Passiflora lutea L. | 316 images |
| Pastinaca sativa L. | 7652 images |
| Paulownia tomentosa (Thunb.) Steud. | 10853 images |
| Pectiantia pentandra (Hook.) Rydb. | 23 images |
| Pectis angustifolia Torr. | 13 images |
| Pedicularis canadensis L. | 211 images |
| Pedicularis crenulata Benth. | 6 images |
| Pedicularis lanceolata Michx. | 24 images |
| Pedicularis procera A.Gray | 4 images |
| Pediocactus simpsonii (Engelm.) Britton & Rose | 23 images |
| Pediomelum rhombifolium (Torr. & A.Gray) Rydb. | 1 images |
| Peltandra virginica (L.) Schott | 171 images |
| Penstemon albidus Nutt. | 11 images |
| Penstemon ambiguus Torr. | 23 images |
| Penstemon angustifolius Nutt. ex Pursh | 10 images |
| Penstemon arkansanus Pennell | 23 images |
| Penstemon buckleyi Pennell | 6 images |
| Penstemon calycosus Small | 36 images |
| Penstemon canescens Britton | 50 images |
| Penstemon cobaea Nutt. | 197 images |
| Penstemon digitalis Nutt. ex Sims | 1513 images |
| Penstemon eriantherus Nutt. ex Pursh | 8 images |
| Penstemon glaber Pursh | 21 images |
| Penstemon gracilis Nutt. | 21 images |
| Penstemon haydenii S.Watson ex J.M.Coult. | 2 images |
| Penstemon hirsutus (L.) Willd. | 188 images |
| Penstemon jamesii Benth. | 17 images |
| Penstemon laevigatus Aiton | 7 images |
| Penstemon laxiflorus Pennell | 15 images |
| Penstemon murrayanus Hook. | 10 images |
| Penstemon nitidus Douglas ex Benth. | 16 images |
| Penstemon pallidus Small | 33 images |
| Penstemon procerus Douglas ex Graham | 68 images |
| Penstemon tenuis Small | 49 images |
| Penthorum sedoides L. | 62 images |
| Pericome caudata A.Gray | 16 images |
| Perideridia gairdneri (Hook. & Arn.) Mathias | 2 images |
| Perilla frutescens (L.) Britton | 2960 images |
| Periploca graeca L. | 380 images |
| Persicaria amphibia (L.) Delarbre | 566 images |
| Persicaria careyi (Olney) Greene | 1 images |
| Persicaria glabra (Willd.) M.Gómez | 24 images |
| Persicaria hydropiper (L.) Delarbre | 896 images |
| Persicaria hydropiperoides (Michx.) Small | 22 images |
| Persicaria lapathifolia (L.) Delarbre | 4177 images |
| Persicaria longiseta (Bruijn) Kitag. | 11 images |
| Persicaria maculosa Gray | 10749 images |
| Persicaria minor (Huds.) Opiz | 383 images |
| Persicaria orientalis (L.) Spach | 3299 images |
| Persicaria pensylvanica (L.) M.Gómez | 85 images |
| Persicaria punctata (Elliott) Small | 116 images |
| Persicaria sagittata (L.) H.Gross | 44 images |
| Persicaria virginiana (L.) Gaertn. | 1305 images |
| Petasites frigidus (L.) Fr. | 255 images |
| Petrophytum caespitosum (Nutt.) Rydb. | 26 images |
| Petrorhagia dubia (Raf.) G.López & Romo | 62 images |
| Petrorhagia prolifera (L.) P.W.Ball & Heywood | 1532 images |
| Petrorhagia saxifraga (L.) Link | 2086 images |
| Petrosedum ochroleucum (Chaix) Niederle | 976 images |
| Petrosedum rupestre (L.) P.V.Heath | 6740 images |
| Petroselinum crispum (Mill.) Fuss | 2913 images |
| Petunia axillaris (Lam.) Britton, Sterns & Poggenb. | 99 images |
| Petunia integrifolia (Hook.) Schinz & Thell. | 166 images |
| Phacelia bipinnatifida Michx. | 122 images |
| Phacelia congesta Hook. | 84 images |
| Phacelia distans Benth. | 156 images |
| Phacelia hastata Douglas ex Lehm. | 89 images |
| Phacelia hirsuta Nutt. | 13 images |
| Phacelia integrifolia Torr. | 20 images |
| Phacelia linearis (Pursh) Holz. | 65 images |
| Phacelia purshii Buckley | 113 images |
| Phacelia tanacetifolia Benth. | 17927 images |
| Phalaris arundinacea L. | 3419 images |
| Phalaris brachystachys Link | 10 images |
| Phalaris canariensis L. | 545 images |
| Phaseolus polystachios (L.) Britton, Sterns & Poggenb. | 4 images |
| Phaseolus vulgaris L. | 3085 images |
| Phedimus aizoon (L.) 't Hart | 1327 images |
| Phedimus spurius (M.Bieb.) 't Hart | 4710 images |
| Phegopteris connectilis (Michx.) Watt | 821 images |
| Phegopteris hexagonoptera (Michx.) Fée | 1 images |
| Phellodendron amurense Rupr. | 432 images |
| Phemeranthus calycinus (Engelm.) Kiger | 15 images |
| Phemeranthus parviflorus (Nutt.) Kiger | 7 images |
| Phemeranthus rugospermus (Holz.) Kiger | 2 images |
| Philadelphus coronarius L. | 20360 images |
| Philadelphus inodorus L. | 243 images |
| Philadelphus pubescens Loisel. | 1687 images |
| Phleum alpinum L. | 387 images |
| Phleum pratense L. | 3312 images |
| Phlox amplifolia Britton | 20 images |
| Phlox carolina L. | 52 images |
| Phlox cuspidata Scheele | 10 images |
| Phlox diffusa Benth. | 205 images |
| Phlox divaricata L. | 1072 images |
| Phlox drummondii Hook. | 1609 images |
| Phlox glaberrima L. | 62 images |
| Phlox hoodii Richardson | 82 images |
| Phlox maculata L. | 2071 images |
| Phlox paniculata L. | 7193 images |
| Phlox pilosa L. | 198 images |
| Phlox subulata L. | 5371 images |
| Phoradendron leucarpum (Raf.) Reveal & M.C.Johnst. | 6 images |
| Phragmites australis (Cav.) Trin. ex Steud. | 7416 images |
| Phryma leptostachya L. | 177 images |
| Phyla cuneifolia (Torr.) Greene | 1 images |
| Phyla lanceolata (Michx.) Greene | 145 images |
| Phyla nodiflora (L.) Greene | 1851 images |
| Phyllanthus caroliniensis Walter | 21 images |
| Phyllanthus polygonoides Nutt. ex Spreng. | 31 images |
| Phyllanthus tenellus Roxb. | 865 images |
| Phyllanthus urinaria L. | 563 images |
| Physalis acutifolia (Miers) Sandwith | 6 images |
| Physalis angulata L. | 1158 images |
| Physalis grisea (Waterf.) M.Martínez | 1 images |
| Physalis heterophylla Nees | 160 images |
| Physalis longifolia Nutt. | 277 images |
| Physalis mollis Nutt. | 11 images |
| Physalis philadelphica Lam. | 808 images |
| Physalis pubescens L. | 235 images |
| Physalis pumila Nutt. | 10 images |
| Physalis virginiana Mill. | 3 images |
| Physaria acutifolia Rydb. | 3 images |
| Physaria fendleri (A.Gray) O'Kane & Al-Shehbaz | 1 images |
| Physocarpus monogynus (Torr.) J.M.Coult. | 2 images |
| Physocarpus opulifolius (L.) Maxim. | 5604 images |
| Physostegia angustifolia Fernald | 11 images |
| Physostegia virginiana (L.) Benth. | 2572 images |
| Phytolacca acinosa Roxb. | 5710 images |
| Phytolacca americana L. | 20885 images |
| Phytolacca octandra L. | 30 images |
| Picea × albertiana S.Br. | 4 images |
| Picea abies (L.) H.Karst. | 11229 images |
| Picea laxa (Münchh.) Sarg. | 2076 images |
| Picea mariana (Mill.) Britton, Sterns & Poggenb. | 80 images |
| Picea pungens Engelm. | 6055 images |
| Picris hieracioides L. | 5011 images |
| Picris rhagadioloides (L.) Desf. | 7 images |
| Pilea fontana (Lunell) Rydb. | 2 images |
| Pilea pumila A.Gray | 602 images |
| Pilosella aurantiaca (L.) F.W.Schultz & Sch.Bip. | 9558 images |
| Pilosella caespitosa (Dumort.) P.D.Sell & C.West | 404 images |
| Pilosella officinarum Vaill. | 2983 images |
| Pilosella piloselloides (Vill.) Soják | 304 images |
| Pilularia americana A.Braun | 1 images |
| Pimpinella saxifraga L. | 2365 images |
| Pinaropappus roseus (Less.) Less. | 40 images |
| Pinguicula pumila Michx. | 13 images |
| Pinguicula vulgaris L. | 1490 images |
| Pinus banksiana Lamb. | 476 images |
| Pinus contorta Douglas ex Loudon | 616 images |
| Pinus echinata Mill. | 151 images |
| Pinus edulis Engelm. | 165 images |
| Pinus flexilis E.James | 69 images |
| Pinus nigra J.F.Arnold | 2660 images |
| Pinus ponderosa Douglas ex C.Lawson | 544 images |
| Pinus pungens Lamb. | 57 images |
| Pinus resinosa Aiton | 1532 images |
| Pinus rigida Mill. | 439 images |
| Pinus strobus L. | 4678 images |
| Pinus sylvestris L. | 11713 images |
| Pinus taeda L. | 430 images |
| Pinus virginiana Mill. | 130 images |
| Pinus wallichiana A.B.Jacks. | 1940 images |
| Pistacia chinensis Bunge | 331 images |
| Pistia stratiotes L. | 1054 images |
| Plagiobothrys figuratus (Piper) I.M.Johnst. | 2 images |
| Plagiobothrys scouleri (Hook. & Arn.) I.M.Johnst. | 1 images |
| Plantago aristata Michx. | 26 images |
| Plantago cordata Lam. | 16 images |
| Plantago elongata Pursh | 17 images |
| Plantago eriopoda Torr. | 12 images |
| Plantago heterophylla Nutt. | 1 images |
| Plantago indica L. | 276 images |
| Plantago lanceolata L. | 14873 images |
| Plantago major L. | 11573 images |
| Plantago media L. | 5596 images |
| Plantago patagonica Jacq. | 59 images |
| Plantago pusilla Nutt. | 10 images |
| Plantago rhodosperma Decne. | 34 images |
| Plantago rugelii Decne. | 262 images |
| Plantago virginica L. | 192 images |
| Plantago wrightiana Decne. | 9 images |
| Platanthera aquilonis Sheviak | 27 images |
| Platanthera blephariglottis (Willd.) Lindl. | 39 images |
| Platanthera ciliaris (L.) Lindl. | 82 images |
| Platanthera clavellata (Michx.) Luer | 45 images |
| Platanthera dilatata (Pursh) Lindl. ex L.C.Beck | 7 images |
| Platanthera flava (L.) Lindl. | 17 images |
| Platanthera grandiflora (Bigelow) Lindl. | 11 images |
| Platanthera hookeri (Torr.) Lindl. | 1 images |
| Platanthera lacera (Michx.) G.Don | 42 images |
| Platanthera leucophaea (Nutt.) Lindl. | 12 images |
| Platanthera obtusata (Banks ex Pursh) Lindl. | 13 images |
| Platanthera orbiculata (Pursh) Lindl. | 56 images |
| Platanthera peramoena A.Gray | 10 images |
| Platanthera psycodes (L.) Lindl. | 89 images |
| Platanthera stricta Lindl. | 22 images |
| Platanus occidentalis L. | 9015 images |
| Plectocephalus americanus (Nutt.) D.Don | 8 images |
| Pleopeltis michauxiana (Weath.) Hickey & Sprunt | 1 images |
| Pluchea camphorata (L.) DC. | 67 images |
| Pluchea foetida (L.) DC. | 17 images |
| Pluchea odorata (L.) Cass. | 292 images |
| Poa angustifolia L. | 4 images |
| Poa annua L. | 3255 images |
| Poa arachnifera Torr. | 19 images |
| Poa arida Vasey | 2 images |
| Poa autumnalis Muhl. ex Elliott | 3 images |
| Poa bulbosa L. | 1257 images |
| Poa chaixii Vill. | 109 images |
| Poa compressa L. | 136 images |
| Poa cusickii Vasey | 7 images |
| Poa fendleriana (Steud.) Vasey | 13 images |
| Poa glauca Vahl | 40 images |
| Poa nemoralis L. | 525 images |
| Poa palustris L. | 144 images |
| Poa pratensis L. | 3304 images |
| Poa secunda J.Presl | 9 images |
| Poa trivialis L. | 2177 images |
| Podophyllum peltatum L. | 2057 images |
| Podostemum ceratophyllum Michx. | 6 images |
| Pogonia ophioglossoides (L.) Ker Gawl. | 136 images |
| Polemonium caeruleum L. | 1696 images |
| Polemonium micranthum Benth. | 4 images |
| Polemonium occidentale Greene | 103 images |
| Polemonium reptans L. | 454 images |
| Polygala alba Nutt. | 27 images |
| Polygala cruciata L. | 9 images |
| Polygala polygama Walter | 33 images |
| Polygala sanguinea L. | 69 images |
| Polygala senega L. | 30 images |
| Polygala verticillata L. | 5 images |
| Polygaloides paucifolia (Willd.) J.R.Abbott | 203 images |
| Polygonatum biflorum (Walter) Elliott | 841 images |
| Polygonatum pubescens (Willd.) Pursh | 184 images |
| Polygonum arenastrum Boreau | 224 images |
| Polygonum articulatum L. | 1 images |
| Polygonum aviculare L. | 5838 images |
| Polygonum cilinode Michx. | 3 images |
| Polygonum douglasii Greene | 5 images |
| Polygonum patulum M.Bieb. | 4 images |
| Polygonum serotinum Raf. | 1 images |
| Polygonum tenue Michx. | 3 images |
| Polymnia canadensis L. | 157 images |
| Polypodium virginianum L. | 306 images |
| Polypogon monspeliensis (L.) Desf. | 926 images |
| Polypogon viridis (Gouan) Breistr. | 272 images |
| Polypremum procumbens L. | 102 images |
| Polystichum acrostichoides (Michx.) Schott | 679 images |
| Polystichum braunii (Spenn.) Fée | 200 images |
| Polystichum lonchitis (L.) Roth | 716 images |
| Polystichum munitum (Kaulf.) C.Presl | 968 images |
| Polytaenia nuttallii DC. | 16 images |
| Polytaenia texana (J.M.Coult. & Rose) Mathias & Constance | 91 images |
| Pombalia verticillata (Ortega) Paula-Souza | 9 images |
| Pontederia cordata L. | 1834 images |
| Pontederia crassipes Mart. | 1785 images |
| Populus × canescens (Aiton) Sm. | 2572 images |
| Populus alba L. | 12912 images |
| Populus angustifolia E.James | 5 images |
| Populus balsamifera L. | 1992 images |
| Populus deltoides W.Bartram ex Marshall | 944 images |
| Populus grandidentata Michx. | 342 images |
| Populus heterophylla L. | 24 images |
| Populus nigra L. | 14819 images |
| Populus tremuloides Michx. | 1616 images |
| Portulaca grandiflora Hook. | 8149 images |
| Portulaca halimoides L. | 31 images |
| Portulaca oleracea L. | 13995 images |
| Portulaca pilosa L. | 852 images |
| Portulaca umbraticola Kunth | 2070 images |
| Potamogeton alpinus Balb. | 30 images |
| Potamogeton amplifolius Tuck. | 8 images |
| Potamogeton berchtoldii Fieber | 26 images |
| Potamogeton crispus L. | 194 images |
| Potamogeton diversifolius Raf. | 1 images |
| Potamogeton epihydrus Raf. | 4 images |
| Potamogeton foliosus Raf. | 5 images |
| Potamogeton friesii Rupr. | 9 images |
| Potamogeton gramineus L. | 49 images |
| Potamogeton natans L. | 656 images |
| Potamogeton nodosus Poir. | 350 images |
| Potamogeton obtusifolius Mert. & W.D.J.Koch | 17 images |
| Potamogeton perfoliatus L. | 199 images |
| Potamogeton praelongus Wulfen | 25 images |
| Potamogeton pusillus L. | 45 images |
| Potentilla argentea L. | 3128 images |
| Potentilla biennis Greene | 5 images |
| Potentilla canadensis L. | 110 images |
| Potentilla concinna Richardson | 8 images |
| Potentilla gracilis Douglas ex Hook. | 206 images |
| Potentilla grandiflora L. | 419 images |
| Potentilla hippiana Lehm. | 14 images |
| Potentilla inclinata Vill. | 70 images |
| Potentilla indica (Andrews) Th.Wolf | 6078 images |
| Potentilla intermedia L. | 118 images |
| Potentilla norvegica L. | 893 images |
| Potentilla pensylvanica L. | 21 images |
| Potentilla plattensis Nutt. | 1 images |
| Potentilla recta L. | 3950 images |
| Potentilla reptans L. | 11547 images |
| Potentilla simplex Michx. | 537 images |
| Potentilla supina L. | 212 images |
| Primula fassettii A.R.Mast & Reveal | 2 images |
| Primula meadia (L.) A.R.Mast & Reveal | 290 images |
| Primula mistassinica Michx. | 4 images |
| Primula pauciflora (Durand) A.R.Mast & Reveal | 52 images |
| Proboscidea louisianica (Mill.) Thell. | 277 images |
| Prosartes trachycarpa S.Watson | 48 images |
| Proserpinaca palustris L. | 4 images |
| Prosopis glandulosa Torr. | 496 images |
| Prunella vulgaris L. | 23379 images |
| Prunus × subhirtella Miq. | 2266 images |
| Prunus americana Marshall | 88 images |
| Prunus angustifolia Marshall | 3 images |
| Prunus armeniaca L. | 6273 images |
| Prunus avium (L.) L. | 21446 images |
| Prunus cerasus L. | 12058 images |
| Prunus glandulosa Thunb. | 311 images |
| Prunus mahaleb L. | 7362 images |
| Prunus mexicana S.Watson | 18 images |
| Prunus nigra Aiton | 6 images |
| Prunus padus L. | 14727 images |
| Prunus pensylvanica L.f. | 644 images |
| Prunus persica (L.) Batsch | 11388 images |
| Prunus pumila L. | 43 images |
| Prunus rivularis Scheele | 31 images |
| Prunus serotina Ehrh. | 9578 images |
| Prunus susquehanae Willd. | 6 images |
| Prunus tomentosa Thunb. | 433 images |
| Prunus triloba Lindl. | 1298 images |
| Prunus virginiana L. | 3772 images |
| Psammophiliella muralis (L.) Ikonn. | 665 images |
| Pseudognaphalium canescens (DC.) Anderb. | 2 images |
| Pseudognaphalium obtusifolium (L.) Hilliard & B.L.Burtt | 106 images |
| Pseudognaphalium stramineum (Kunth) Anderb. | 119 images |
| Ptelea trifoliata L. | 542 images |
| Pteris multifida Poir. | 22 images |
| Pterospora andromedea Nutt. | 273 images |
| Ptilimnium nuttallii (DC.) Britton | 6 images |
| Puccinellia distans (Jacq.) Parl. | 107 images |
| Pueraria montana (Lour.) Merr. | 472 images |
| Purshia tridentata (Pursh) DC. | 197 images |
| Pycnanthemum albescens Torr. & A.Gray | 2 images |
| Pycnanthemum incanum (L.) Michx. | 130 images |
| Pycnanthemum muticum (Michx.) Pers. | 175 images |
| Pycnanthemum pycnanthemoides (Leavenw.) Fernald | 5 images |
| Pycnanthemum tenuifolium Schrad. | 339 images |
| Pycnanthemum verticillatum (Michx.) Pers. | 106 images |
| Pycnanthemum virginianum (L.) T.Durand & B.D.Jacks. ex B.L.Rob. & Fernald | 20 images |
| Pyracantha coccinea M.Roem. | 16486 images |
| Pyracantha koidzumii (Hayata) Rehder | 905 images |
| Pyrola americana G.Don | 31 images |
| Pyrola asarifolia Michx. | 133 images |
| Pyrola chlorantha Sw. | 384 images |
| Pyrola elliptica Nutt. | 176 images |
| Pyrola minor L. | 724 images |
| Pyrola picta Sm. | 128 images |
| Pyrrhopappus carolinianus (Walter) DC. | 300 images |
| Pyrrhopappus grandiflorus (Nutt.) Nutt. | 2 images |
| Pyrrocoma lanceolata (Hook.) Greene | 1 images |
| Pyrus betulifolia Bunge | 16 images |
| Pyrus calleryana Decne. | 5380 images |
| Pyrus communis L. | 11391 images |
| Pyrus pyrifolia (Burm.f.) Nakai | 578 images |
| Quercus × benderi Baen. | 3 images |
| Quercus × heterophylla F.Michx. | 8 images |
| Quercus × leana Nutt. | 6 images |
| Quercus × ludoviciana Sarg. | 1 images |
| Quercus × schochiana Dieck | 1 images |
| Quercus acutissima Carruth. | 341 images |
| Quercus alba L. | 988 images |
| Quercus bicolor Willd. | 913 images |
| Quercus buckleyi Nixon & Dorr | 14 images |
| Quercus coccinea Münchh. | 192 images |
| Quercus ellipsoidalis E.J.Hill | 21 images |
| Quercus falcata Michx. | 85 images |
| Quercus fusiformis Small | 207 images |
| Quercus gambelii Nutt. | 187 images |
| Quercus havardii Rydb. | 7 images |
| Quercus imbricaria Michx. | 289 images |
| Quercus lyrata Walter | 19 images |
| Quercus macrocarpa Michx. | 1563 images |
| Quercus marilandica (L.) Münchh. | 100 images |
| Quercus michauxii Nutt. | 229 images |
| Quercus montana Willd. | 21 images |
| Quercus muehlenbergii Engelm. | 119 images |
| Quercus nigra L. | 1200 images |
| Quercus pagoda Raf. | 4 images |
| Quercus palustris Münchh. | 4524 images |
| Quercus phellos L. | 956 images |
| Quercus prinoides Willd. | 4 images |
| Quercus rubra L. | 12627 images |
| Quercus shumardii Buckley | 119 images |
| Quercus sinuata Walter | 14 images |
| Quercus stellata Wangenh. | 167 images |
| Quercus texana Buckley | 41 images |
| Quercus velutina Lam. | 2060 images |
| Quincula lobata (Torr.) Raf. | 53 images |
| Rabelera holostea (L.) M.T.Sharples & E.A.Tripp | 11444 images |
| Ranunculus abortivus L. | 538 images |
| Ranunculus acris L. | 12807 images |
| Ranunculus ambigens S.Watson | 5 images |
| Ranunculus arvensis L. | 482 images |
| Ranunculus bulbosus L. | 5269 images |
| Ranunculus fascicularis Muhl. ex Bigelow | 73 images |
| Ranunculus ficaria L. | 31144 images |
| Ranunculus flabellaris Raf. | 12 images |
| Ranunculus flammula L. | 2227 images |
| Ranunculus glaberrimus Hook. | 72 images |
| Ranunculus gmelinii DC. | 4 images |
| Ranunculus harveyi (A.Gray) Britton | 8 images |
| Ranunculus hispidus Michx. | 232 images |
| Ranunculus inamoenus Greene | 8 images |
| Ranunculus laxicaulis (Torr. & A.Gray) Darby | 1 images |
| Ranunculus macounii Britton | 11 images |
| Ranunculus micranthus Nutt. | 14 images |
| Ranunculus minimus (L.) E.H.L.Krause | 190 images |
| Ranunculus parviflorus Loefl. | 7 images |
| Ranunculus pensylvanicus L.f. | 2 images |
| Ranunculus pusillus Poir. | 5 images |
| Ranunculus recurvatus Poir. | 256 images |
| Ranunculus repens L. | 15871 images |
| Ranunculus reptans L. | 11 images |
| Ranunculus sardous Crantz | 1069 images |
| Ranunculus sceleratus L. | 1563 images |
| Ranunculus trichophyllus Chaix | 562 images |
| Raphanus raphanistrum L. | 14906 images |
| Rapistrum rugosum (L.) All. | 3387 images |
| Ratibida columnifera (Nutt.) Wooton & Standl. | 531 images |
| Ratibida pinnata (Vent.) Barnhart | 400 images |
| Reseda alba L. | 2080 images |
| Reseda lutea L. | 6716 images |
| Reseda luteola L. | 3384 images |
| Reseda odorata L. | 78 images |
| Reynoutria × bohemica Chrtek & Chrtková | 169 images |
| Reynoutria japonica Houtt. | 11836 images |
| Reynoutria sachalinensis (F.Schmidt) Nakai | 2930 images |
| Rhamnus cathartica L. | 6139 images |
| Rhamnus davurica Pall. | 1 images |
| Rhamnus japonica Maxim. | 1 images |
| Rhamnus utilis Decne. | 7 images |
| Rhamphospermum arvense (L.) Andrz. ex Besser | 10737 images |
| Rhamphospermum nigrum (L.) Al-Shehbaz | 1012 images |
| Rheum rhabarbarum L. | 656 images |
| Rhexia mariana L. | 221 images |
| Rhexia virginica L. | 135 images |
| Rhinanthus minor L. | 3263 images |
| Rhinotropis lindheimeri (A.Gray) J.R.Abbott | 2 images |
| Rhodiola integrifolia Raf. | 82 images |
| Rhododendron canescens (Michx.) Sweet | 192 images |
| Rhododendron groenlandicum (Oeder) Kron & Judd | 81 images |
| Rhododendron lapponicum (L.) Wahlenb. | 313 images |
| Rhododendron periclymenoides (Michx.) Shinners | 274 images |
| Rhododendron roseum (Loisel.) Rehder | 426 images |
| Rhododendron viscosum (L.) Torr. | 160 images |
| Rhodotypos scandens (Thunb.) Makino | 891 images |
| Rhus aromatica Aiton | 761 images |
| Rhus copallinum L. | 1033 images |
| Rhus glabra L. | 2252 images |
| Rhus microphylla Engelm. | 34 images |
| Rhus trilobata Nutt. | 29 images |
| Rhus typhina L. | 11785 images |
| Rhynchosida physocalyx (A.Gray) Fryxell | 22 images |
| Rhynchospora alba (L.) Vahl | 231 images |
| Rhynchospora caduca Elliott | 1 images |
| Rhynchospora capitellata (Michx.) Vahl | 4 images |
| Rhynchospora corniculata (Lam.) A.Gray | 1 images |
| Rhynchospora fusca (L.) W.T.Aiton | 58 images |
| Rhynchospora glomerata (L.) Vahl | 1 images |
| Rhynchospora nivea Boeckeler | 1 images |
| Ribes americanum Mill. | 125 images |
| Ribes aureum Pursh | 1887 images |
| Ribes cereum Douglas | 182 images |
| Ribes cynosbati L. | 331 images |
| Ribes glandulosum Weber | 16 images |
| Ribes hirtellum Michx. | 8 images |
| Ribes hudsonianum Richardson | 6 images |
| Ribes lacustre (Pers.) Poir. | 112 images |
| Ribes missouriense Nutt. | 85 images |
| Ribes nigrum L. | 3363 images |
| Ribes oxyacanthoides L. | 2 images |
| Ribes rubrum L. | 6065 images |
| Ribes triste Pall. | 15 images |
| Ribes uva-crispa L. | 3542 images |
| Ricinus communis L. | 12478 images |
| Rivina humilis L. | 1178 images |
| Robinia hispida L. | 1708 images |
| Robinia pseudoacacia L. | 23648 images |
| Robinia viscosa Michx. ex Vent. | 2823 images |
| Rorippa aquatica (Eaton) E.J.Palmer & Steyerm. | 1 images |
| Rorippa austriaca (Crantz) Besser | 197 images |
| Rorippa curvipes Greene | 10 images |
| Rorippa indica (L.) Hiern | 1 images |
| Rorippa palustris (L.) Besser | 1164 images |
| Rorippa sylvestris (L.) Besser | 2477 images |
| Rosa × dulcissima Lunell | 1 images |
| Rosa acicularis Lindl. | 30 images |
| Rosa arkansana Porter | 109 images |
| Rosa blanda Aiton | 65 images |
| Rosa canina L. | 22266 images |
| Rosa carolina L. | 56 images |
| Rosa gallica L. | 12009 images |
| Rosa glauca Pourr. | 1029 images |
| Rosa lucieae Franch. & Rochebr. ex Crép. | 3609 images |
| Rosa micrantha Borrer ex Sm. | 1365 images |
| Rosa moschata Herrm. | 669 images |
| Rosa multiflora Thunb. | 6161 images |
| Rosa palustris Marshall | 73 images |
| Rosa pendulina L. | 8950 images |
| Rosa rubiginosa L. | 4950 images |
| Rosa rugosa Thunb. | 11084 images |
| Rosa setigera Michx. | 516 images |
| Rosa spinosissima L. | 4814 images |
| Rosa virginiana Mill. | 172 images |
| Rosa woodsii Lindl. | 1128 images |
| Rotala ramosior (L.) Koehne | 9 images |
| Rottboellia campestris Nutt. | 1 images |
| Rottboellia cochinchinensis (Lour.) Clayton | 31 images |
| Rubus allegheniensis Porter | 77 images |
| Rubus arcticus L. | 124 images |
| Rubus argutus Link | 2482 images |
| Rubus armeniacus Focke | 1732 images |
| Rubus caesius L. | 7573 images |
| Rubus canadensis L. | 307 images |
| Rubus chamaemorus L. | 485 images |
| Rubus deliciosus Torr. | 126 images |
| Rubus flagellaris Willd. | 48 images |
| Rubus hispidus L. | 130 images |
| Rubus idaeus L. | 7970 images |
| Rubus illecebrosus Focke | 85 images |
| Rubus nemoralis P.J.Müll. | 1214 images |
| Rubus occidentalis L. | 3756 images |
| Rubus odoratus L. | 1732 images |
| Rubus parvifolius L. | 10 images |
| Rubus pensilvanicus Poir. | 47 images |
| Rubus phoenicolasius Maxim. | 2058 images |
| Rubus pubescens Raf. | 167 images |
| Rubus setosus Bigelow | 7 images |
| Rubus trivialis Michx. | 73 images |
| Rudbeckia amplexicaulis Vahl | 22 images |
| Rudbeckia fulgida Aiton | 8378 images |
| Rudbeckia grandiflora (Sweet) C.C.Gmel. ex DC. | 4 images |
| Rudbeckia hirta L. | 6114 images |
| Rudbeckia laciniata L. | 2987 images |
| Rudbeckia maxima Nutt. | 109 images |
| Rudbeckia missouriensis Engelm. ex C.L.Boynton & Beadle | 7 images |
| Rudbeckia subtomentosa Pursh | 147 images |
| Rudbeckia triloba L. | 1504 images |
| Ruellia caroliniensis (J.F.Gmel.) Steud. | 8 images |
| Ruellia humilis Nutt. | 641 images |
| Ruellia pedunculata Torr. ex A.Gray | 37 images |
| Ruellia strepens L. | 145 images |
| Rumex × acutus L. | 2158 images |
| Rumex acetosa L. | 7210 images |
| Rumex acetosella L. | 5766 images |
| Rumex alpinus L. | 1806 images |
| Rumex altissimus Alph.Wood | 13 images |
| Rumex confertus Willd. | 115 images |
| Rumex conglomeratus Murray | 3341 images |
| Rumex crispus L. | 10522 images |
| Rumex cristatus DC. | 154 images |
| Rumex dentatus L. | 29 images |
| Rumex hymenosepalus Torr. | 94 images |
| Rumex longifolius DC. | 1681 images |
| Rumex obtusifolius L. | 13652 images |
| Rumex occidentalis S.Watson | 4 images |
| Rumex patientia L. | 3378 images |
| Rumex pseudonatronatus (Borbás) Murb. | 6 images |
| Rumex pulcher L. | 2498 images |
| Rumex stenophyllus Ledeb. | 1 images |
| Rumex thyrsiflorus Fingerh. | 393 images |
| Rumex venosus Pursh | 12 images |
| Rumex verticillatus L. | 31 images |
| Ruppia cirrhosa (Petagna) Grande | 36 images |
| Ruta graveolens L. | 3618 images |
| Sabal minor (Jacq.) Pers. | 326 images |
| Sabatia angularis (L.) Pursh | 182 images |
| Sabatia campestris Nutt. | 142 images |
| Sabulina michauxii (Fenzl) Dillenb. & Kadereit | 7 images |
| Sabulina rubella (Wahlenb.) Dillenb. & Kadereit | 2 images |
| Sacciolepis striata (L.) Nash | 3 images |
| Sagina apetala Ard. | 241 images |
| Sagina japonica (Sw.) Ohwi | 5 images |
| Sagina nodosa (L.) Fenzl | 168 images |
| Sagina procumbens L. | 1086 images |
| Sagittaria graminea Michx. | 83 images |
| Sagittaria latifolia Willd. | 820 images |
| Sagittaria montevidensis Cham. & Schltdl. | 169 images |
| Sagittaria rigida Pursh | 9 images |
| Salicornia rubra A.Nelson | 18 images |
| Salix × fragilis L. | 97 images |
| Salix × pendulina Wender. | 819 images |
| Salix alba L. | 10998 images |
| Salix amygdaloides Andersson | 33 images |
| Salix atrocinerea Brot. | 4226 images |
| Salix babylonica L. | 6786 images |
| Salix bebbiana Sarg. | 47 images |
| Salix candida Flüggé ex Willd. | 7 images |
| Salix caprea L. | 13224 images |
| Salix caroliniana Michx. | 43 images |
| Salix cinerea L. | 6372 images |
| Salix daphnoides Vill. | 176 images |
| Salix discolor Muhl. | 480 images |
| Salix eleagnos Scop. | 3132 images |
| Salix eriocephala Michx. | 103 images |
| Salix exigua Nutt. | 275 images |
| Salix gooddingii C.R.Ball | 6 images |
| Salix humilis Marshall | 20 images |
| Salix interior Rowlee | 8 images |
| Salix lasiandra Benth. | 3 images |
| Salix lucida Muhl. | 77 images |
| Salix myricoides Muhl. | 1 images |
| Salix nigra Marshall | 181 images |
| Salix pentandra L. | 1364 images |
| Salix planifolia Pursh | 9 images |
| Salix purpurea L. | 3616 images |
| Salix pyrifolia Andersson | 2 images |
| Salix scouleriana Barratt ex Hook. | 20 images |
| Salix sericea Marshall | 11 images |
| Salix viminalis L. | 2175 images |
| Salsola collina Pall. | 1 images |
| Salsola tragus L. | 64 images |
| Salvia × sylvestris L. | 1602 images |
| Salvia azurea Michx. ex Vahl | 103 images |
| Salvia farinacea Benth. | 5800 images |
| Salvia lyrata L. | 864 images |
| Salvia nemorosa L. | 4653 images |
| Salvia nutans L. | 48 images |
| Salvia pratensis L. | 17341 images |
| Salvia reflexa Hornem. | 34 images |
| Salvia sclarea L. | 4461 images |
| Salvia splendens Sellow ex Nees | 1911 images |
| Salvia verticillata L. | 2134 images |
| Salvinia minima Baker | 70 images |
| Salvinia molesta D.Mitch. | 45 images |
| Sambucus canadensis L. | 5821 images |
| Sambucus cerulea Raf. | 13 images |
| Sambucus racemosa L. | 9622 images |
| Samolus ebracteatus Kunth | 14 images |
| Samolus parviflorus Raf. | 2 images |
| Sanguinaria canadensis L. | 1700 images |
| Sanguisorba canadensis L. | 198 images |
| Sanguisorba minor Scop. | 9258 images |
| Sanicula canadensis L. | 523 images |
| Sanicula marilandica L. | 33 images |
| Sanicula odorata (Raf.) Pryer & Phillippe | 1 images |
| Sanicula trifoliata E.P.Bicknell | 1 images |
| Saponaria officinalis L. | 18256 images |
| Sarcobatus vermiculatus (Hook.) Torr. | 46 images |
| Sarracenia purpurea L. | 1352 images |
| Sassafras albidum (Nutt.) Nees | 1696 images |
| Satureja hortensis L. | 1509 images |
| Saururus cernuus L. | 403 images |
| Saxifraga cernua L. | 32 images |
| Saxifraga paniculata Mill. | 2927 images |
| Scabiosa atropurpurea L. | 6022 images |
| Scandix pecten-veneris L. | 2878 images |
| Scheuchzeria palustris L. | 127 images |
| Schizachyrium scoparium (Michx.) Nash | 91 images |
| Schoenoplectiella hallii (A.Gray) Lye | 1 images |
| Schoenoplectiella mucronata (L.) J.Jung & H.K.Choi | 39 images |
| Schoenoplectiella purshiana (Fernald) Lye | 4 images |
| Schoenoplectus californicus (C.A.Mey.) Soják | 39 images |
| Schoenoplectus pungens (Vahl) Palla | 65 images |
| Schoenoplectus tabernaemontani (C.C.Gmel.) Palla | 91 images |
| Scilla luciliae (Boiss.) Speta | 3984 images |
| Scilla siberica Andrews | 2428 images |
| Scirpus atrovirens Willd. | 217 images |
| Scirpus cyperinus (L.) Kunth | 150 images |
| Scirpus hattorianus Makino | 12 images |
| Scirpus microcarpus J.Presl & C.Presl | 4 images |
| Scirpus pendulus Muhl. | 32 images |
| Scirpus polyphyllus Vahl | 4 images |
| Scleranthus annuus L. | 320 images |
| Scleranthus perennis L. | 604 images |
| Sclerochloa dura (L.) P.Beauv. | 62 images |
| Scorzonera laciniata L. | 652 images |
| Scorzoneroides autumnalis (L.) Moench | 3419 images |
| Scrophularia lanceolata Pursh | 18 images |
| Scrophularia marilandica L. | 59 images |
| Scrophularia nodosa L. | 4705 images |
| Scutellaria brittonii Porter | 2 images |
| Scutellaria drummondii Benth. | 52 images |
| Scutellaria galericulata L. | 1518 images |
| Scutellaria incana Biehler | 104 images |
| Scutellaria lateriflora L. | 111 images |
| Scutellaria nervosa Pursh | 1 images |
| Scutellaria ovata Hill | 81 images |
| Scutellaria parvula Michx. | 34 images |
| Scutellaria serrata Andrews | 26 images |
| Scutellaria wrightii A.Gray | 1 images |
| Secale cereale L. | 3665 images |
| Sedum acre L. | 8151 images |
| Sedum album L. | 10963 images |
| Sedum lanceolatum Torr. | 98 images |
| Sedum pulchellum Michx. | 50 images |
| Sedum sarmentosum Bunge | 867 images |
| Sedum sexangulare L. | 2417 images |
| Sedum ternatum Michx. | 363 images |
| Selaginella apoda (L.) Spring | 17 images |
| Selaginella selaginoides (L.) P.Beauv. ex Schrank & Mart. | 169 images |
| Selenia aurea Nutt. | 1 images |
| Sempervivum heuffelii Schott | 49 images |
| Senecio eremophilus Richardson | 2 images |
| Senecio flaccidus Less. | 162 images |
| Senecio hydrophilus Nutt. | 6 images |
| Senecio integerrimus Nutt. | 158 images |
| Senecio riddellii Torr. & A.Gray | 4 images |
| Senecio spartioides Torr. & A.Gray | 23 images |
| Senecio sylvaticus L. | 2484 images |
| Senecio viscosus L. | 899 images |
| Senecio vulgaris L. | 9693 images |
| Senna hebecarpa (Fernald) H.S.Irwin & Barneby | 20 images |
| Senna marilandica (L.) Link | 241 images |
| Senna obtusifolia (L.) H.S.Irwin & Barneby | 512 images |
| Senna occidentalis (L.) Link | 1508 images |
| Sesamum indicum L. | 423 images |
| Sesbania herbacea (Mill.) McVaugh | 130 images |
| Sesbania vesicaria (Jacq.) Elliott | 15 images |
| Sesuvium maritimum (Walter) Britton, Sterns & Poggenb. | 1 images |
| Sesuvium revolutifolium Ortega | 41 images |
| Setaria faberi R.A.W.Herrm. | 34 images |
| Setaria geminata (Forssk.) Veldkamp | 12 images |
| Setaria italica (L.) P.Beauv. | 1604 images |
| Setaria leucopila (Scribn. & Merr.) K.Schum. | 3 images |
| Setaria parviflora (Poir.) Kerguélen | 194 images |
| Setaria pumila (Poir.) Roem. & Schult. | 3350 images |
| Setaria verticillata (L.) P.Beauv. | 1584 images |
| Setaria viridis (L.) P.Beauv. | 261 images |
| Shepherdia argentea (Pursh) Nutt. | 63 images |
| Shepherdia canadensis (L.) Nutt. | 179 images |
| Sherardia arvensis L. | 4374 images |
| Sibbaldia tridentata (Aiton) Paule & Soják | 61 images |
| Sicyos angulatus L. | 465 images |
| Sida elliottii Torr. & A.Gray | 2 images |
| Sida rhombifolia L. | 948 images |
| Sida spinosa L. | 174 images |
| Sideroxylon lanuginosum Michx. | 106 images |
| Sideroxylon lycioides L. | 17 images |
| Sigesbeckia orientalis L. | 239 images |
| Silene antirrhina L. | 15 images |
| Silene caroliniana Walter | 27 images |
| Silene chalcedonica (L.) E.H.L.Krause | 1251 images |
| Silene conica L. | 592 images |
| Silene conoidea L. | 14 images |
| Silene coronaria (L.) Clairv. | 7344 images |
| Silene csereii Baumg. | 4 images |
| Silene dichotoma Ehrh. | 1660 images |
| Silene dioica (L.) Clairv. | 18655 images |
| Silene flos-cuculi (L.) Greuter & Burdet | 7982 images |
| Silene gallica L. | 1855 images |
| Silene latifolia Poir. | 20620 images |
| Silene noctiflora L. | 2254 images |
| Silene ovata Pursh | 5 images |
| Silene regia Sims | 101 images |
| Silene stellata (L.) Coyte | 134 images |
| Silene virginica L. | 332 images |
| Silene vulgaris (Moench) Garcke | 16706 images |
| Silphium asteriscus L. | 88 images |
| Silphium integrifolium Michx. | 136 images |
| Silphium laciniatum L. | 262 images |
| Silphium perfoliatum L. | 1695 images |
| Silphium radula Nutt. | 36 images |
| Silphium terebinthinaceum Jacq. | 237 images |
| Silybum marianum (L.) Gaertn. | 9808 images |
| Sinapis alba L. | 6861 images |
| Sisymbrium altissimum L. | 377 images |
| Sisymbrium loeselii L. | 1636 images |
| Sisymbrium officinale (L.) Scop. | 6276 images |
| Sisyrinchium albidum Raf. | 39 images |
| Sisyrinchium angustifolium Mill. | 1049 images |
| Sisyrinchium langloisii Greene | 58 images |
| Sisyrinchium montanum Greene | 177 images |
| Sisyrinchium mucronatum Michx. | 5 images |
| Sium suave Walter | 71 images |
| Smallanthus uvedalia (L.) Mack. | 96 images |
| Smilax bona-nox L. | 829 images |
| Smilax ecirrhata (Engelm. ex Kunth) S.Watson | 2 images |
| Smilax glauca Walter | 65 images |
| Smilax lasioneura Hook. | 13 images |
| Smilax laurifolia L. | 51 images |
| Smilax maritima Feay ex Alph.Wood | 1 images |
| Smilax rotundifolia L. | 951 images |
| Smilax tamnoides L. | 208 images |
| Solanum aethiopicum L. | 187 images |
| Solanum alatum Moench | 3 images |
| Solanum americanum Mill. | 6243 images |
| Solanum carolinense L. | 1783 images |
| Solanum chenopodioides Lam. | 2379 images |
| Solanum citrullifolium A.Braun | 20 images |
| Solanum dimidiatum Raf. | 182 images |
| Solanum dulcamara L. | 16187 images |
| Solanum elaeagnifolium Cav. | 1800 images |
| Solanum lycopersicum L. | 16910 images |
| Solanum nigrum L. | 14266 images |
| Solanum physalifolium Rusby | 240 images |
| Solanum rostratum Dunal | 592 images |
| Solanum sarrachoides Sendtn. | 5 images |
| Solanum scabrum Mill. | 103 images |
| Solanum triflorum Nutt. | 76 images |
| Solanum tuberosum L. | 9265 images |
| Solanum villosum Mill. | 2645 images |
| Solidago × luteus (A.Perry) Brouillet & Semple | 5 images |
| Solidago altissima L. | 962 images |
| Solidago arguta Aiton | 9 images |
| Solidago bicolor L. | 139 images |
| Solidago caesia L. | 512 images |
| Solidago canadensis L. | 14820 images |
| Solidago drummondii Torr. & A.Gray | 1 images |
| Solidago flexicaulis L. | 409 images |
| Solidago gigantea Aiton | 7650 images |
| Solidago hispida Muhl. ex Willd. | 33 images |
| Solidago juncea Aiton | 681 images |
| Solidago missouriensis Nutt. | 36 images |
| Solidago mollis Bartl. | 5 images |
| Solidago nemoralis Aiton | 194 images |
| Solidago odora Aiton | 72 images |
| Solidago ohioensis Riddell | 7 images |
| Solidago patula Muhl. ex Willd. | 23 images |
| Solidago petiolaris Aiton | 11 images |
| Solidago ptarmicoides (Torr. & A.Gray) B.Boivin | 20 images |
| Solidago rigida L. | 231 images |
| Solidago rugosa Mill. | 1619 images |
| Solidago sempervirens L. | 98 images |
| Solidago simplex Kunth | 28 images |
| Solidago speciosa Nutt. | 131 images |
| Solidago sphacelata Raf. | 3 images |
| Solidago uliginosa Nutt. | 34 images |
| Solidago ulmifolia Muhl. ex Willd. | 87 images |
| Soliva sessilis Ruiz & Pav. | 167 images |
| Sonchus arvensis L. | 6023 images |
| Sonchus asper (L.) Hill | 14563 images |
| Sonchus oleraceus L. | 14635 images |
| Sorbaria sorbifolia (L.) A.Braun | 3309 images |
| Sorbus americana Marshall | 289 images |
| Sorbus aucuparia L. | 21298 images |
| Sorbus decora (Sarg.) C.K.Schneid. | 17 images |
| Sorbus scopulina Greene | 60 images |
| Sorghastrum nutans (L.) Nash | 195 images |
| Sorghastrum secundum (Elliott) Nash | 2 images |
| Sorghum × drummondii (Nees ex Steud.) Millsp. & Chase | 3 images |
| Sorghum bicolor (L.) Moench | 2530 images |
| Sorghum halepense (L.) Pers. | 3429 images |
| Sparganium americanum Nutt. | 39 images |
| Sparganium androcladum (Engelm.) Morong | 3 images |
| Sparganium angustifolium Michx. | 277 images |
| Sparganium emersum Rehmann | 206 images |
| Sparganium eurycarpum Engelm. | 51 images |
| Sparganium natans L. | 51 images |
| Spergula arvensis L. | 1247 images |
| Spergularia marina (L.) Besser | 718 images |
| Spergularia media (L.) C.Presl | 364 images |
| Spergularia rubra (L.) J.Presl & C.Presl | 1619 images |
| Spermacoce glabra Michx. | 32 images |
| Sphaeralcea angustifolia (Cav.) G.Don | 33 images |
| Sphaeralcea coccinea (Nutt.) Rydb. | 193 images |
| Sphaeralcea fendleri A.Gray | 7 images |
| Sphenoclea zeylanica Gaertn. | 23 images |
| Sphenopholis intermedia (Rydb.) Rydb. | 9 images |
| Sphenopholis obtusata (Michx.) Scribn. | 9 images |
| Spigelia marilandica (L.) L. | 205 images |
| Spiraea alba Du Roi | 2414 images |
| Spiraea douglasii Hook. | 4006 images |
| Spiraea japonica L.f. | 13194 images |
| Spiraea prunifolia Siebold & Zucc. | 279 images |
| Spiraea thunbergii Siebold ex Blume | 2242 images |
| Spiraea tomentosa L. | 863 images |
| Spiranthes cernua (L.) Rich. | 172 images |
| Spiranthes diluvialis Sheviak | 5 images |
| Spiranthes lacera (Raf.) Raf. | 70 images |
| Spiranthes lucida (H.H.Eaton) Ames | 12 images |
| Spiranthes magnicamporum Sheviak | 27 images |
| Spiranthes odorata (Nutt.) Lindl. | 4 images |
| Spiranthes ovalis Lindl. | 31 images |
| Spiranthes praecox (Walter) S.Watson | 6 images |
| Spiranthes romanzoffiana Cham. | 102 images |
| Spiranthes tuberosa Raf. | 3 images |
| Spiranthes vernalis Engelm. & A.Gray | 62 images |
| Spirodela polyrhiza (L.) Schleid. | 211 images |
| Spirodela punctata (G.Mey.) C.H.Thomps. | 5 images |
| Sporobolus airoides (Torr.) Torr. | 28 images |
| Sporobolus cryptandrus (Torr.) A.Gray | 9 images |
| Sporobolus heterolepis (A.Gray) A.Gray | 16 images |
| Sporobolus hookerianus P.M.Peterson & Saarela | 4 images |
| Sporobolus indicus (L.) R.Br. | 483 images |
| Sporobolus michauxianus (Hitchc.) P.M.Peterson & Saarela | 82 images |
| Sporobolus neglectus Nash | 2 images |
| Sporobolus pyramidatus (Lam.) Hitchc. | 4 images |
| Sporobolus rigidus (Buckley) P.M.Peterson | 7 images |
| Sporobolus schoenoides (L.) P.M.Peterson | 88 images |
| Sporobolus vaginiflorus (Torr. ex A.Gray) Alph.Wood | 8 images |
| Stachys annua (L.) L. | 596 images |
| Stachys byzantina K.Koch | 8665 images |
| Stachys palustris L. | 6012 images |
| Stachys pilosa Nutt. | 18 images |
| Stachys tenuifolia Willd. | 18 images |
| Stanleya pinnata (Pursh) Britton | 96 images |
| Staphylea trifolia L. | 315 images |
| Steinchisma hians (Elliott) Nash | 4 images |
| Stellaria alsine Grimm | 279 images |
| Stellaria apetala Ucria | 181 images |
| Stellaria aquatica (L.) Scop. | 1761 images |
| Stellaria borealis Bigelow | 3 images |
| Stellaria crassifolia Ehrh. | 20 images |
| Stellaria graminea L. | 4970 images |
| Stellaria longifolia Muhl. ex Willd. | 15 images |
| Stellaria longipes Goldie | 26 images |
| Stellaria media (L.) Vill. | 12935 images |
| Stellaria neglecta (Lej.) Weihe | 2 images |
| Stellaria palustris Ehrh. ex Hoffm. | 4815 images |
| Stellaria pubera Michx. | 256 images |
| Stenanthium gramineum (Ker Gawl.) Morong | 22 images |
| Stenaria nigricans (Lam.) Terrell | 110 images |
| Stenotaphrum secundatum (Walter) Kuntze | 566 images |
| Stenotus armerioides Nutt. | 14 images |
| Stephanomeria pauciflora (Torr.) A.Nelson | 1 images |
| Stephanomeria tenuifolia (Torr.) H.M.Hall | 1 images |
| Stillingia sylvatica L. | 35 images |
| Stillingia texana I.M.Johnst. | 1 images |
| Streptopus amplexifolius (L.) DC. | 619 images |
| Streptopus lanceolatus (Aiton) Reveal | 112 images |
| Strigosella africana (L.) Botsch. | 170 images |
| Strophostyles helvola (L.) Elliott | 101 images |
| Stuckenia filiformis (Pers.) Börner | 5 images |
| Stuckenia pectinata (L.) Börner | 154 images |
| Stylophorum diphyllum (Michx.) Nutt. | 465 images |
| Styrax americanus Lam. | 25 images |
| Styrax grandifolius Aiton | 3 images |
| Suaeda calceoliformis (Hook.) Moq. | 1 images |
| Suaeda nigra (Raf.) J.F.Macbr. | 1 images |
| Subularia aquatica L. | 27 images |
| Symphoricarpos albus (L.) S.F.Blake | 11451 images |
| Symphoricarpos occidentalis (R.Br.) Hook. | 74 images |
| Symphoricarpos orbiculatus Moench | 3448 images |
| Symphoricarpos rotundifolius A.Gray | 44 images |
| Symphyotrichum × salignum (Willd.) G.L.Nesom | 240 images |
| Symphyotrichum cordifolium (L.) G.L.Nesom | 1065 images |
| Symphyotrichum drummondii (Lindl.) G.L.Nesom | 1 images |
| Symphyotrichum dumosum (L.) G.L.Nesom | 71 images |
| Symphyotrichum ericoides (L.) G.L.Nesom | 2121 images |
| Symphyotrichum laeve (L.) Á.Löve & D.Löve | 261 images |
| Symphyotrichum lanceolatum (Willd.) G.L.Nesom | 3545 images |
| Symphyotrichum lateriflorum (L.) Á.Löve & D.Löve | 153 images |
| Symphyotrichum novae-angliae (L.) G.L.Nesom | 3288 images |
| Symphyotrichum oblongifolium (Nutt.) G.L.Nesom | 102 images |
| Symphyotrichum ontarionis (Wiegand) G.L.Nesom | 7 images |
| Symphyotrichum oolentangiense (Riddell) G.L.Nesom | 294 images |
| Symphyotrichum patens (Aiton) G.L.Nesom | 4 images |
| Symphyotrichum pilosum (Willd.) G.L.Nesom | 434 images |
| Symphyotrichum praealtum (Poir.) G.L.Nesom | 5 images |
| Symphyotrichum puniceum (L.) Á.Löve & D.Löve | 176 images |
| Symphyotrichum racemosum (Elliott) G.L.Nesom | 7 images |
| Symphyotrichum sericeum (Vent.) G.L.Nesom | 13 images |
| Symphyotrichum shortii (Lindl.) G.L.Nesom | 13 images |
| Symphyotrichum subulatum (Michx.) G.L.Nesom | 934 images |
| Symphytum asperum Lepech. | 2978 images |
| Symphytum officinale L. | 20926 images |
| Symplocarpus foetidus (L.) Salisb. ex W.P.C.Barton | 556 images |
| Symplocos tinctoria (L.) L'Hér. | 5 images |
| Synandra hispidula (Michx.) Baill. | 2 images |
| Syringa pubescens Turcz. | 1219 images |
| Syringa vulgaris L. | 21378 images |
| Taenidia integerrima (L.) Drude | 47 images |
| Tagetes erecta L. | 14711 images |
| Tamarix chinensis Lour. | 227 images |
| Tamarix gallica L. | 6644 images |
| Tamarix parviflora DC. | 3243 images |
| Tamarix ramosissima Ledeb. | 1926 images |
| Tanacetum balsamita L. | 604 images |
| Tanacetum bipinnatum Sch.Bip. | 34 images |
| Tanacetum parthenium (L.) Sch.Bip. | 9394 images |
| Tanacetum vulgare L. | 19529 images |
| Taraxacum erythrospermum Andrz. ex Besser | 1212 images |
| Taraxacum sect. Taraxacum F.H.Wigg. | 14736 images |
| Taxodium distichum (L.) Rich. | 9965 images |
| Taxus canadensis Marshall | 1553 images |
| Tephrosia onobrychoides Nutt. | 2 images |
| Tephrosia virginiana (L.) Pers. | 77 images |
| Tetragonia tetragonoides (Pall.) Kuntze | 667 images |
| Tetraneuris acaulis Greene | 25 images |
| Tetraneuris herbacea Greene | 9 images |
| Tetraneuris linearifolia Greene | 25 images |
| Tetraneuris scaposa (DC.) Greene | 131 images |
| Teucrium canadense L. | 658 images |
| Teucrium laciniatum Torr. | 25 images |
| Thalia dealbata Fraser | 530 images |
| Thalictrum dasycarpum Fisch., C.A.Mey. & Avé-Lall. | 10 images |
| Thalictrum dioicum L. | 537 images |
| Thalictrum fendleri Engelm. ex A.Gray | 62 images |
| Thalictrum occidentale A.Gray | 37 images |
| Thalictrum pubescens Pursh | 572 images |
| Thalictrum revolutum DC. | 25 images |
| Thalictrum venulosum Trel. | 1 images |
| Thaspium barbinode (Michx.) Nutt. | 35 images |
| Thaspium trifoliatum (L.) A.Gray | 22 images |
| Thelesperma filifolium (Hook.) A.Gray | 5 images |
| Thelesperma megapotamicum (Spreng.) Herter | 44 images |
| Thelypodium integrifolium (Nutt.) Endl. | 2 images |
| Thelypteris noveboracensis (L.) Nieuwl. | 296 images |
| Thelypteris palustris Schott | 395 images |
| Thermopsis rhombifolia (Pursh) Richardson | 2 images |
| Thesium ramosum Hayne | 11 images |
| Thinopyrum elongatum (Host) D.R.Dewey | 23 images |
| Thinopyrum intermedium (Host) Barkworth & D.R.Dewey | 19 images |
| Thladiantha dubia Bunge | 133 images |
| Thlaspi arvense L. | 2913 images |
| Thuja occidentalis L. | 7736 images |
| Thymelaea passerina (L.) Coss. & Germ. | 77 images |
| Thymus praecox Opiz | 2774 images |
| Thymus pulegioides L. | 2869 images |
| Tiarella stolonifera G.L.Nesom | 3 images |
| Tidestromia lanuginosa (Nutt.) Standl. | 27 images |
| Tilia × europaea L. | 6435 images |
| Tilia americana L. | 5002 images |
| Tilia cordata Mill. | 12603 images |
| Tipularia discolor (Pursh) Nutt. | 349 images |
| Tiquilia nuttallii (Hook.) A.T.Richardson | 1 images |
| Tofieldia pusilla (Michx.) Pers. | 90 images |
| Tomostima cuneifolia (Nutt.) Al-Shehbaz, M.Koch & Jordon-Thaden | 1 images |
| Torenia fournieri Linden ex E.Fourn. | 62 images |
| Torilis arvensis (Huds.) Link | 5538 images |
| Torilis japonica (Houtt.) DC. | 2025 images |
| Torilis nodosa (L.) Gaertn. | 1007 images |
| Torreyochloa pallida (Torr.) Church | 10 images |
| Townsendia exscapa (Richardson) Porter | 12 images |
| Townsendia hookeri Beaman | 10 images |
| Toxicodendron pubescens Mill. | 70 images |
| Toxicodendron radicans (L.) Kuntze | 5485 images |
| Toxicodendron rydbergii (Small ex Rydb.) Greene | 145 images |
| Toxicodendron vernix (L.) Kuntze | 77 images |
| Toxicoscordion nuttallii (A.Gray) Rydb. | 1 images |
| Toxicoscordion venenosum (S.Watson) Rydb. | 47 images |
| Tradescantia bracteata Small ex Britton | 8 images |
| Tradescantia hirsutiflora Bush | 7 images |
| Tradescantia longipes E.S.Anderson & Woodson | 4 images |
| Tradescantia occidentalis (Britton) Smyth | 122 images |
| Tradescantia ohiensis Raf. | 1019 images |
| Tradescantia subaspera Ker Gawl. | 68 images |
| Tradescantia virginiana L. | 5577 images |
| Tragia cordata Michx. | 13 images |
| Tragia ramosa Torr. | 41 images |
| Tragopogon dubius Scop. | 6766 images |
| Tragopogon porrifolius L. | 5065 images |
| Tragopogon pratensis L. | 9073 images |
| Trautvetteria caroliniensis (Walter) Vail | 40 images |
| Triantha glutinosa (Michx.) Baker | 46 images |
| Trianthema portulacastrum L. | 325 images |
| Tribulus terrestris L. | 2484 images |
| Trichophorum alpinum (L.) Pers. | 137 images |
| Trichophorum cespitosum (L.) Hartm. | 415 images |
| Trichostema brachiatum L. | 25 images |
| Trichostema dichotomum L. | 141 images |
| Trichostema setaceum Houtt. | 4 images |
| Tridens albescens (Vasey) Wooton & Standl. | 5 images |
| Tridens flavus (L.) Hitchc. | 71 images |
| Tridens strictus (Nutt.) Nash | 4 images |
| Tridentopsis mutica (Torr.) P.M.Peterson | 3 images |
| Trifolium arvense L. | 4008 images |
| Trifolium attenuatum Greene | 4 images |
| Trifolium aureum Pollich | 1038 images |
| Trifolium campestre Schreb. | 4474 images |
| Trifolium dubium Sibth. | 3744 images |
| Trifolium fragiferum L. | 1418 images |
| Trifolium hybridum L. | 1842 images |
| Trifolium incarnatum L. | 7626 images |
| Trifolium pratense L. | 19082 images |
| Trifolium reflexum L. | 3 images |
| Trifolium repens L. | 13434 images |
| Trifolium resupinatum L. | 1534 images |
| Trifolium stoloniferum Muhl. | 1 images |
| Trifolium striatum L. | 255 images |
| Triglochin maritima L. | 398 images |
| Triglochin palustris L. | 167 images |
| Trillium cernuum L. | 80 images |
| Trillium cuneatum Raf. | 314 images |
| Trillium erectum L. | 1085 images |
| Trillium flexipes Raf. | 74 images |
| Trillium grandiflorum (Michx.) Salisb. | 1004 images |
| Trillium nivale Riddell | 30 images |
| Trillium pusillum Michx. | 4 images |
| Trillium recurvatum L.C.Beck | 11 images |
| Trillium sessile L. | 329 images |
| Trillium viridescens Nutt. | 8 images |
| Triodanis perfoliata (L.) Nieuwl. | 635 images |
| Triosteum angustifolium L. | 9 images |
| Triosteum aurantiacum E.P.Bicknell | 6 images |
| Triosteum perfoliatum L. | 54 images |
| Triphora trianthophoros (Sw.) Rydb. | 9 images |
| Tripidium ravennae (L.) H.Scholz | 108 images |
| Triplasis purpurea (Walter) Chapm. | 4 images |
| Tripleurospermum inodorum (L.) Sch.Bip. | 2553 images |
| Tripleurospermum maritimum (L.) W.D.J.Koch | 928 images |
| Tripsacum dactyloides (L.) L. | 91 images |
| Trisetum flavescens (L.) P.Beauv. | 706 images |
| Triticum aestivum L. | 21917 images |
| Tsuga canadensis (L.) Carrière | 1640 images |
| Tulipa sylvestris L. | 4026 images |
| Turritis glabra L. | 1067 images |
| Tussilago farfara L. | 12544 images |
| Typha × glauca Godr. | 62 images |
| Typha angustifolia L. | 1186 images |
| Typha domingensis Pers. | 249 images |
| Typha latifolia L. | 3857 images |
| Ulmus alata Michx. | 604 images |
| Ulmus americana L. | 4972 images |
| Ulmus crassifolia Nutt. | 205 images |
| Ulmus glabra Huds. | 8429 images |
| Ulmus minor Mill. | 15445 images |
| Ulmus pumila L. | 3776 images |
| Ulmus rubra Muhl. | 149 images |
| Ulmus serotina Sarg. | 29 images |
| Ulmus thomasii Sarg. | 161 images |
| Urochloa fusca (Sw.) B.F.Hansen & Wunderlin | 18 images |
| Urochloa ramosa (L.) T.Q.Nguyen | 8 images |
| Urtica chamaedryoides Pursh | 45 images |
| Urtica dioica L. | 16092 images |
| Urtica gracilis Aiton | 2 images |
| Urtica urens L. | 4526 images |
| Utricularia cornuta Michx. | 5 images |
| Utricularia geminiscapa Benj. | 13 images |
| Utricularia gibba L. | 50 images |
| Utricularia inflata Walter | 2 images |
| Utricularia intermedia Hayne | 82 images |
| Utricularia minor L. | 139 images |
| Utricularia ochroleuca R.W.Hartm. | 14 images |
| Utricularia purpurea Walter | 15 images |
| Utricularia radiata Small | 12 images |
| Utricularia striata Leconte ex Torr. | 8 images |
| Utricularia subulata L. | 37 images |
| Uvularia grandiflora Sm. | 276 images |
| Uvularia sessilifolia L. | 138 images |
| Vaccinium angustifolium Aiton | 796 images |
| Vaccinium arboreum Marshall | 216 images |
| Vaccinium cespitosum Michx. | 3 images |
| Vaccinium corymbosum L. | 2808 images |
| Vaccinium macrocarpon Aiton | 359 images |
| Vaccinium membranaceum Douglas ex Torr. | 80 images |
| Vaccinium myrtilloides Michx. | 54 images |
| Vaccinium ovalifolium Sm. | 63 images |
| Vaccinium oxycoccos L. | 547 images |
| Vaccinium pallidum Aiton | 184 images |
| Vaccinium scoparium Leiberg ex Coville | 26 images |
| Vaccinium stamineum L. | 173 images |
| Vaccinium uliginosum L. | 1762 images |
| Vaccinium vitis-idaea L. | 3334 images |
| Valeriana acutiloba Rydb. | 2 images |
| Valeriana dioica L. | 2799 images |
| Valeriana locusta L. | 6540 images |
| Valeriana occidentalis A.Heller | 7 images |
| Valeriana officinalis L. | 9798 images |
| Valeriana pauciflora Michx. | 52 images |
| Valeriana sitchensis Bong. | 97 images |
| Valeriana umbilicata (Sull.) Christenh. & Byng | 13 images |
| Valeriana woodsiana (Torr. & A.Gray) Christenh. & Byng | 161 images |
| Vallisneria americana Michx. | 14 images |
| Verbascum blattaria L. | 3902 images |
| Verbascum densiflorum Bertol. | 8649 images |
| Verbascum lychnitis L. | 4297 images |
| Verbascum nigrum L. | 10619 images |
| Verbascum phlomoides L. | 3631 images |
| Verbascum speciosum Schrad. | 619 images |
| Verbascum thapsus L. | 17130 images |
| Verbascum virgatum Stokes | 1720 images |
| Verbena bipinnatifida Schauer | 456 images |
| Verbena bonariensis L. | 10104 images |
| Verbena bracteata Cav. ex Lag. & Rodr. | 58 images |
| Verbena brasiliensis Vell. | 984 images |
| Verbena canadensis (L.) Britton | 159 images |
| Verbena halei Small | 186 images |
| Verbena hastata L. | 1358 images |
| Verbena incompta P.W.Michael | 89 images |
| Verbena litoralis Kunth | 121 images |
| Verbena officinalis L. | 8521 images |
| Verbena peruviana (L.) Britton | 198 images |
| Verbena pumila Rydb. | 33 images |
| Verbena rigida Spreng. | 2178 images |
| Verbena simplex Lehm. | 74 images |
| Verbena stricta Vent. | 407 images |
| Verbena urticifolia L. | 988 images |
| Verbena xutha Lehm. | 4 images |
| Verbesina alternifolia (L.) Britton ex Kearney | 714 images |
| Verbesina encelioides (Cav.) Benth. & Hook.f. ex A.Gray | 612 images |
| Verbesina helianthoides Michx. | 25 images |
| Verbesina occidentalis Walter | 221 images |
| Verbesina virginica L. | 419 images |
| Verbesina walteri Shinners | 8 images |
| Vernonia arkansana DC. | 55 images |
| Vernonia baldwinii Torr. | 809 images |
| Vernonia fasciculata Michx. | 158 images |
| Vernonia gigantea (Walter) Trel. | 26 images |
| Vernonia lettermannii Engelm. ex A.Gray | 5 images |
| Vernonia marginata (Torr.) Raf. | 10 images |
| Vernonia missurica Raf. | 28 images |
| Vernonia texana (A.Gray) Small | 13 images |
| Veronica agrestis L. | 1770 images |
| Veronica anagallis-aquatica L. | 1768 images |
| Veronica arvensis L. | 3344 images |
| Veronica austriaca L. | 2585 images |
| Veronica beccabunga L. | 2904 images |
| Veronica bullii (Eaton) M.M.Mart.Ort. & Albach | 1 images |
| Veronica catenata Pennell | 123 images |
| Veronica chamaedrys L. | 19497 images |
| Veronica dillenii Crantz | 55 images |
| Veronica hederifolia L. | 3238 images |
| Veronica longifolia L. | 2156 images |
| Veronica officinalis L. | 3953 images |
| Veronica peregrina L. | 366 images |
| Veronica persica Poir. | 14757 images |
| Veronica polita Fr. | 2568 images |
| Veronica scutellata L. | 334 images |
| Veronica serpyllifolia L. | 3924 images |
| Veronica sublobata M.A.Fisch. | 835 images |
| Veronica teucrium L. | 907 images |
| Veronica triphyllos L. | 155 images |
| Veronica verna L. | 202 images |
| Veronicastrum virginicum (L.) Farw. | 1465 images |
| Vesper macrorhizus (Buckley) R.L.Hartm. & G.L.Nesom | 18 images |
| Viburnum acerifolium L. | 767 images |
| Viburnum cassinoides L. | 17 images |
| Viburnum dentatum L. | 701 images |
| Viburnum dilatatum Thunb. | 198 images |
| Viburnum edule (Michx.) Raf. | 34 images |
| Viburnum lantana L. | 15329 images |
| Viburnum lentago L. | 350 images |
| Viburnum opulus L. | 20757 images |
| Viburnum plicatum Thunb. | 4972 images |
| Viburnum prunifolium L. | 532 images |
| Viburnum rafinesqueanum Schult. | 4 images |
| Viburnum recognitum Fernald | 68 images |
| Viburnum rhytidophyllum Hemsl. | 6367 images |
| Viburnum rufidulum Raf. | 248 images |
| Viburnum trilobum Marshall | 2877 images |
| Vicia americana Muhl. ex Willd. | 103 images |
| Vicia caroliniana Walter | 52 images |
| Vicia cracca L. | 8862 images |
| Vicia hirsuta (L.) Gray | 2383 images |
| Vicia ludoviciana Nutt. | 31 images |
| Vicia sativa L. | 14665 images |
| Vicia tetrasperma (L.) Schreb. | 742 images |
| Vicia villosa Roth | 9100 images |
| Vigna unguiculata (L.) Walp. | 338 images |
| Vinca major L. | 17011 images |
| Vinca minor L. | 16309 images |
| Vincetoxicum nigrum (L.) Moench | 645 images |
| Vincetoxicum rossicum (Kleopow) Barbar. | 20 images |
| Viola adunca Sm. | 191 images |
| Viola arvensis Murray | 5562 images |
| Viola blanda Willd. | 302 images |
| Viola canadensis L. | 253 images |
| Viola cucullata Aiton | 43 images |
| Viola labradorica Schrank | 247 images |
| Viola lanceolata L. | 58 images |
| Viola macloskeyi F.E.Lloyd | 10 images |
| Viola nephrophylla Greene | 5 images |
| Viola nuttallii Pursh | 36 images |
| Viola odorata L. | 15082 images |
| Viola palmata L. | 19 images |
| Viola palustris L. | 1159 images |
| Viola pedata L. | 178 images |
| Viola pedatifida G.Don | 19 images |
| Viola pubescens Aiton | 917 images |
| Viola renifolia A.Gray | 6 images |
| Viola rostrata Muhl. ex Pursh | 91 images |
| Viola sagittata Aiton | 115 images |
| Viola selkirkii Pursh ex Goldie | 12 images |
| Viola sororia Willd. | 1838 images |
| Viola striata Aiton | 285 images |
| Viola tricolor L. | 8672 images |
| Viola villosa Walter | 8 images |
| Viscaria vulgaris Röhl. | 43 images |
| Vitis aestivalis Michx. | 1656 images |
| Vitis cinerea (Engelm.) Millardet | 2 images |
| Vitis labrusca L. | 715 images |
| Vitis mustangensis Buckley | 208 images |
| Vitis riparia Michx. | 1035 images |
| Vitis rotundifolia Michx. | 1733 images |
| Vitis rupestris Scheele | 48 images |
| Vitis vulpina L. | 1266 images |
| Waldsteinia fragarioides (Michx.) Tratt. | 35 images |
| Wisteria floribunda (Willd.) DC. | 3559 images |
| Wisteria frutescens (L.) Poir. | 1213 images |
| Wisteria sinensis (Sims) DC. | 1810 images |
| Wolffia brasiliensis Wedd. | 270 images |
| Wolffia columbiana H.Karst. | 1 images |
| Wolffia globosa (Roxb.) Hartog & Plas | 1 images |
| Wolffiella gladiata (Hegelm.) Hegelm. | 1 images |
| Woodsia alpina (Bolton) Gray | 65 images |
| Woodsia glabella R.Br. | 1 images |
| Woodsia ilvensis (L.) R.Br. | 95 images |
| Woodsia obtusa (Spreng.) Torr. | 18 images |
| Woodsia oregana D.C.Eaton | 14 images |
| Woodsia scopulina D.C.Eaton | 9 images |
| Woodwardia areolata (L.) T.Moore | 1 images |
| Woodwardia virginica (L.) Sm. | 19 images |
| Wyethia sagittata (Pursh) Mabb. | 254 images |
| Xanthisma texanum DC. | 24 images |
| Xanthium chinense Mill. | 1 images |
| Xanthium orientale L. | 509 images |
| Xanthium spinosum L. | 1130 images |
| Xylorhiza glabriuscula Nutt. | 6 images |
| Xyris difformis Chapm. | 3 images |
| Xyris jupicai Rich. | 348 images |
| Xyris montana Ries | 3 images |
| Xyris torta Sm. | 7 images |
| Yucca arkansana Trel. | 63 images |
| Yucca flaccida Haw. | 281 images |
| Yucca glauca Nutt. | 169 images |
| Zannichellia palustris L. | 75 images |
| Zanthoxylum americanum Mill. | 270 images |
| Zanthoxylum clava-herculis L. | 176 images |
| Zea mays L. | 24267 images |
| Zeltnera beyrichii (Torr.) G.Mans. | 1 images |
| Zeltnera calycosa (Buckley) G.Mans. | 1 images |
| Zeltnera exaltata (Griseb.) G.Mans. | 1 images |
| Zeltnera texensis (Griseb.) G.Mans. ex J.S.Pringle | 1 images |
| Zephyranthes chlorosolen (Herb.) D.Dietr. | 2 images |
| Zinnia grandiflora Nutt. | 40 images |
| Zizania aquatica L. | 18 images |
| Zizia aptera (A.Gray) Fernald | 283 images |
| Zizia aurea (L.) W.D.J.Koch | 83 images |
| Zoysia japonica Steud. | 12 images |