| Abelmoschus esculentus (L.) Moench | 1300 images |
| Abies balsamea (L.) Mill. | 948 images |
| Abronia fragrans Nutt. ex Hook. | 72 images |
| Abutilon theophrasti Medik. | 2890 images |
| Acaciella angustissima (Mill.) Britton & Rose | 68 images |
| Acalypha rhomboidea Raf. | 3 images |
| Acalypha virginica L. | 987 images |
| Acer campestre L. | 18780 images |
| Acer glabrum Torr. | 146 images |
| Acer grandidentatum Nutt. | 71 images |
| Acer negundo L. | 16131 images |
| Acer palmatum Thunb. | 11825 images |
| Acer pensylvanicum L. | 784 images |
| Acer platanoides L. | 16327 images |
| Acer pseudoplatanus L. | 21671 images |
| Acer rubrum L. | 5861 images |
| Acer saccharinum L. | 7579 images |
| Acer saccharum Marshall | 1662 images |
| Acer spicatum Lam. | 424 images |
| Acer tataricum L. | 2963 images |
| Achillea alpina L. | 18 images |
| Achillea millefolium L. | 25081 images |
| Achillea nobilis L. | 8818 images |
| Achillea ptarmica L. | 3194 images |
| Achyranthes bidentata Blume | 25 images |
| Acmispon americanus (Nutt.) Rydb. | 26 images |
| Aconitum columbianum Nutt. | 171 images |
| Aconitum uncinatum L. | 10 images |
| Acorus calamus L. | 630 images |
| Actaea cordifolia DC. | 1 images |
| Actaea pachypoda Elliott | 795 images |
| Actaea racemosa L. | 603 images |
| Actaea rubra (Aiton) Willd. | 704 images |
| Adenocaulon bicolor Hook. | 135 images |
| Adiantum capillus-veneris L. | 3071 images |
| Adiantum pedatum L. | 554 images |
| Adlumia fungosa (Aiton) Britton, Sterns & Poggenb. | 8 images |
| Adonis annua L. | 827 images |
| Adoxa moschatellina L. | 764 images |
| Aegilops cylindrica Host | 56 images |
| Aegopodium podagraria L. | 11418 images |
| Aesculus × bushii C.K.Schneid. | 13 images |
| Aesculus flava Sol. | 254 images |
| Aesculus glabra Willd. | 895 images |
| Aesculus hippocastanum L. | 16809 images |
| Aesculus pavia L. | 1472 images |
| Aethusa cynapium L. | 1792 images |
| Agalinis aspera (Douglas ex Benth.) Britton | 1 images |
| Agalinis purpurea (L.) Pennell | 165 images |
| Agalinis skinneriana (Alph.Wood ex A.Gray) Britton | 8 images |
| Agalinis tenuifolia (Vahl) Raf. | 101 images |
| Agastache foeniculum (Pursh) Kuntze | 1806 images |
| Agastache nepetoides (L.) Kuntze | 63 images |
| Agastache scrophulariifolia (Willd.) Kuntze | 19 images |
| Agave virginica L. | 54 images |
| Ageratina altissima (L.) R.M.King & H.Rob. | 1086 images |
| Ageratum conyzoides L. | 555 images |
| Agoseris aurantiaca (Hook.) Greene | 46 images |
| Agoseris glauca (Pursh) Raf. | 33 images |
| Agrimonia eupatoria L. | 10691 images |
| Agrimonia gryposepala Wallr. | 308 images |
| Agrimonia pubescens Wallr. | 20 images |
| Agrimonia rostellata Wallr. | 29 images |
| Agrimonia striata Michx. | 18 images |
| Agropyron cristatum (L.) Gaertn. | 108 images |
| Agropyron desertorum (Fisch. ex Link) Schult. | 3 images |
| Agrostemma githago L. | 3771 images |
| Agrostis canina L. | 50 images |
| Agrostis capillaris L. | 1545 images |
| Agrostis exarata Trin. | 11 images |
| Agrostis gigantea Roth | 135 images |
| Agrostis hyemalis (Walter) Britton, Sterns & Poggenb. | 4 images |
| Agrostis perennans (Walter) Tuck. | 4 images |
| Agrostis scabra Willd. | 2 images |
| Agrostis stolonifera L. | 360 images |
| Ailanthus altissima (Mill.) Swingle | 11652 images |
| Ajuga genevensis L. | 4027 images |
| Ajuga reptans L. | 21611 images |
| Albizia julibrissin Durazz. | 12668 images |
| Alcea rosea L. | 14462 images |
| Alcea rugosa Alef. | 3 images |
| Alchemilla australis (Rydb.) Bomble | 55 images |
| Alchemilla monticola Opiz | 637 images |
| Aletris aurea Walter | 3 images |
| Aletris farinosa L. | 19 images |
| Alisma gramineum Lej. | 21 images |
| Alisma subcordatum Raf. | 28 images |
| Alisma triviale Pursh | 35 images |
| Alkekengi officinarum Moench | 4387 images |
| Alliaria petiolata (M.Bieb.) Cavara & Grande | 30764 images |
| Allionia incarnata L. | 144 images |
| Allium ampeloprasum L. | 6128 images |
| Allium atroviolaceum Boiss. | 176 images |
| Allium canadense L. | 316 images |
| Allium cepa L. | 2328 images |
| Allium cernuum Roth | 235 images |
| Allium drummondii Regel | 54 images |
| Allium fistulosum L. | 632 images |
| Allium geyeri S.Watson | 3 images |
| Allium sativum L. | 1221 images |
| Allium schoenoprasum L. | 4350 images |
| Allium stellatum Nutt. ex Ker Gawl. | 19 images |
| Allium tricoccum Aiton | 398 images |
| Allium tuberosum Rottler ex Spreng. | 1272 images |
| Allium vineale L. | 3225 images |
| Alnus alnobetula (Ehrh.) K.Koch | 1599 images |
| Alnus glutinosa (L.) Gaertn. | 15120 images |
| Alnus incana (L.) Moench | 2462 images |
| Alnus maritima (Marshall) Muhl. ex Nutt. | 4 images |
| Alnus serrulata (Aiton) Willd. | 130 images |
| Alopecurus aequalis Sobol. | 119 images |
| Alopecurus arundinaceus Poir. | 36 images |
| Alopecurus carolinianus Walter | 3 images |
| Alopecurus geniculatus L. | 113 images |
| Alopecurus myosuroides Huds. | 506 images |
| Alopecurus pratensis L. | 2735 images |
| Alternanthera caracasana Kunth | 133 images |
| Alternanthera paronychioides A.St.-Hil. | 57 images |
| Alternanthera philoxeroides (Mart.) Griseb. | 337 images |
| Althaea armeniaca Ten. | 3 images |
| Althaea officinalis L. | 3242 images |
| Alyssum alyssoides (L.) L. | 1042 images |
| Alyssum desertorum Stapf | 20 images |
| Alyssum simplex Rudolphi | 177 images |
| Amaranthus albus L. | 492 images |
| Amaranthus blitoides S.Watson | 496 images |
| Amaranthus blitum L. | 2197 images |
| Amaranthus californicus (Moq.) S.Watson | 12 images |
| Amaranthus caudatus L. | 3555 images |
| Amaranthus cruentus L. | 1053 images |
| Amaranthus hybridus L. | 1403 images |
| Amaranthus hypochondriacus L. | 1206 images |
| Amaranthus palmeri S.Watson | 117 images |
| Amaranthus powellii S.Watson | 82 images |
| Amaranthus retroflexus L. | 8286 images |
| Amaranthus spinosus L. | 1284 images |
| Ambrosia acanthicarpa Hook. | 63 images |
| Ambrosia artemisiifolia L. | 4740 images |
| Ambrosia bidentata Michx. | 20 images |
| Ambrosia confertiflora DC. | 19 images |
| Ambrosia psilostachya DC. | 359 images |
| Ambrosia trifida L. | 976 images |
| Amelanchier alnifolia (Nutt.) Nutt. ex M.Roem. | 615 images |
| Amelanchier arborea (F.Michx.) Fernald | 31 images |
| Amelanchier bartramiana (Tausch) M.Roem. | 3 images |
| Amelanchier canadensis (L.) Medik. | 2315 images |
| Amelanchier interior E.L.Nielsen | 2 images |
| Amelanchier laevis Wiegand | 174 images |
| Amelanchier stolonifera Wiegand | 7 images |
| Amianthium muscitoxicum (Walter) A.Gray | 20 images |
| Ammannia auriculata Willd. | 13 images |
| Ammannia coccinea Rottb. | 47 images |
| Ammannia robusta Heer & Regel | 5 images |
| Ammi majus L. | 1788 images |
| Amorpha canescens Pursh | 209 images |
| Amorpha fruticosa L. | 1881 images |
| Amorpha ouachitensis Wilbur | 4 images |
| Ampelopsis cordata Michx. | 363 images |
| Ampelopsis glandulosa (Wall.) Momiy. | 117 images |
| Amphiachyris dracunculoides (DC.) Nutt. | 96 images |
| Amphicarpaea bracteata (L.) Fernald | 417 images |
| Amsinckia menziesii (Lehm.) A.Nelson & J.F.Macbr. | 211 images |
| Amsonia ciliata Walter | 94 images |
| Amsonia hubrichtii Woodson | 197 images |
| Amsonia tabernaemontana Walter | 685 images |
| Anaphalis margaritacea (L.) Benth. & Hook.f. | 1292 images |
| Anchusa arvensis (L.) M.Bieb. | 2669 images |
| Anchusa azurea Mill. | 3048 images |
| Anchusa officinalis L. | 4541 images |
| Andersonglossum virginianum (L.) J.I.Cohen | 234 images |
| Andromeda polifolia L. | 558 images |
| Andropogon gerardi Vitman | 181 images |
| Andropogon glomeratus (Walter) Britton, Sterns & Poggenb. | 6 images |
| Andropogon gyrans Ashe | 9 images |
| Andropogon ternarius Michx. | 32 images |
| Andropogon virginicus L. | 3 images |
| Androsace occidentalis Pursh | 5 images |
| Androsace septentrionalis L. | 159 images |
| Androstephium coeruleum (Scheele) Greene | 5 images |
| Anemonastrum canadense (L.) Mosyakin | 851 images |
| Anemone berlandieri Pritz. | 153 images |
| Anemone caroliniana Walter | 9 images |
| Anemone cylindrica A.Gray | 14 images |
| Anemone multifida Poir. | 97 images |
| Anemone virginiana L. | 319 images |
| Anemonella thalictroides (L.) Spach | 381 images |
| Anemonoides quinquefolia (L.) Holub | 1265 images |
| Anemopsis californica (Nutt.) Hook. & Arn. | 101 images |
| Anethum graveolens L. | 2458 images |
| Angelica atropurpurea L. | 371 images |
| Anoda cristata (L.) Schltdl. | 61 images |
| Antennaria howellii Greene | 21 images |
| Antennaria microphylla Rydb. | 5 images |
| Antennaria neglecta Greene | 181 images |
| Antennaria parlinii Fernald | 24 images |
| Antennaria parvifolia Nutt. | 88 images |
| Antennaria plantaginifolia (L.) Hook. | 199 images |
| Antennaria rosea Greene | 2 images |
| Anthemis arvensis L. | 3854 images |
| Anthemis cotula L. | 1484 images |
| Anthoxanthum aristatum Boiss. | 54 images |
| Anthoxanthum nitens (Weber) Y.Schouten & Veldkamp | 72 images |
| Anthoxanthum odoratum L. | 2209 images |
| Anthriscus caucalis M.Bieb. | 1700 images |
| Anthriscus cerefolium (L.) Hoffm. | 3006 images |
| Anthriscus sylvestris (L.) Hoffm. | 19284 images |
| Anthyllis vulneraria L. | 8242 images |
| Anticlea elegans (Pursh) Rydb. | 41 images |
| Antirrhinum majus L. | 14601 images |
| Apera interrupta (L.) P.Beauv. | 31 images |
| Apera spica-venti (L.) P.Beauv. | 64 images |
| Aphanostephus pilosus Buckley | 4 images |
| Aphanostephus ramosissimus DC. | 36 images |
| Apios americana Medik. | 295 images |
| Apium graveolens L. | 1877 images |
| Aplectrum hyemale (Muhl. ex Willd.) Torr. | 28 images |
| Apocynum androsaemifolium L. | 995 images |
| Apocynum cannabinum L. | 880 images |
| Aquarius cordifolius (L.) Christenh. & Byng | 89 images |
| Aquilegia brevistyla Hook. | 1 images |
| Aquilegia canadensis L. | 1848 images |
| Aquilegia vulgaris L. | 20316 images |
| Arabidopsis lyrata (L.) O'Kane & Al-Shehbaz | 2 images |
| Arabidopsis thaliana (L.) Heynh. | 2082 images |
| Arabis caucasica Willd. | 733 images |
| Arabis hirsuta (L.) Scop. | 1410 images |
| Arachis hypogaea L. | 858 images |
| Aralia chinensis L. | 14 images |
| Aralia elata (Miq.) Seem. | 736 images |
| Aralia hispida Vent. | 63 images |
| Aralia nudicaulis L. | 785 images |
| Aralia racemosa L. | 264 images |
| Aralia spinosa L. | 420 images |
| Arctium lappa L. | 9754 images |
| Arctium minus (Hill) Bernh. | 11310 images |
| Arctium tomentosum Mill. | 1892 images |
| Arctostaphylos uva-ursi (L.) Spreng. | 2000 images |
| Arenaria benthamii Fenzl ex Torr. & A.Gray | 1 images |
| Arenaria serpyllifolia L. | 1302 images |
| Arethusa bulbosa L. | 42 images |
| Argemone albiflora Hornem. | 226 images |
| Argemone mexicana L. | 1099 images |
| Argemone polyanthemos (Fedde) Ownbey | 9 images |
| Argemone squarrosa Greene | 5 images |
| Argentina anserina (L.) Rydb. | 4750 images |
| Arisaema dracontium (L.) Schott | 338 images |
| Arisaema triphyllum (L.) Schott | 2019 images |
| Aristida adscensionis L. | 125 images |
| Aristida purpurea Nutt. | 7 images |
| Aristolochia serpentaria L. | 19 images |
| Aristolochia tomentosa Sims | 75 images |
| Armoracia rusticana G.Gaertn., B.Mey. & Scherb. | 246 images |
| Arnica cordifolia Hook. | 196 images |
| Arnica fulgens Pursh | 5 images |
| Arnica lonchophylla Greene | 4 images |
| Arnoglossum atriplicifolium (L.) H.Rob. | 78 images |
| Arnoglossum plantagineum Raf. | 47 images |
| Aronia × prunifolia (Marshall) Rehder | 18 images |
| Aronia arbutifolia (L.) Pers. | 154 images |
| Aronia melanocarpa (Michx.) Elliott | 2990 images |
| Arrhenatherum elatius (L.) P.Beauv. ex J.Presl & C.Presl | 1833 images |
| Artemisia abrotanum L. | 1320 images |
| Artemisia absinthium L. | 4745 images |
| Artemisia annua L. | 3418 images |
| Artemisia biennis Willd. | 132 images |
| Artemisia campestris L. | 1591 images |
| Artemisia cana Pursh | 28 images |
| Artemisia dracunculus L. | 2248 images |
| Artemisia filifolia Torr. | 26 images |
| Artemisia frigida Willd. | 110 images |
| Artemisia ludoviciana Nutt. | 1101 images |
| Artemisia pontica L. | 73 images |
| Artemisia stelleriana Besser | 171 images |
| Artemisia tridentata Nutt. | 328 images |
| Artemisia vulgaris L. | 16571 images |
| Arthraxon hispidus (Thunb.) Makino | 44 images |
| Arum italicum Mill. | 17264 images |
| Aruncus dioicus (Walter) Fernald | 4359 images |
| Arundinaria gigantea (Walter) Muhl. | 191 images |
| Arundo donax L. | 2947 images |
| Asarum canadense L. | 595 images |
| Asclepias amplexicaulis Sm. | 51 images |
| Asclepias arenaria Torr. | 15 images |
| Asclepias asperula (Decne.) Woodson | 441 images |
| Asclepias engelmanniana Woodson | 8 images |
| Asclepias exaltata L. | 95 images |
| Asclepias hirtella (Pennell) Woodson | 16 images |
| Asclepias incarnata L. | 1088 images |
| Asclepias involucrata Engelm. ex Torr. | 2 images |
| Asclepias lanuginosa Nutt. | 5 images |
| Asclepias latifolia (Torr.) Raf. | 123 images |
| Asclepias macrotis Torr. | 5 images |
| Asclepias meadii Torr. ex A.Gray | 3 images |
| Asclepias obovata Elliott | 2 images |
| Asclepias ovalifolia Decne. | 6 images |
| Asclepias perennis Walter | 44 images |
| Asclepias pumila (A.Gray) Vail | 6 images |
| Asclepias purpurascens L. | 520 images |
| Asclepias quadrifolia Jacq. | 89 images |
| Asclepias speciosa Torr. | 689 images |
| Asclepias stenophylla A.Gray | 20 images |
| Asclepias subverticillata (A.Gray) Vail | 16 images |
| Asclepias sullivantii Engelm. ex A.Gray | 271 images |
| Asclepias syriaca L. | 3575 images |
| Asclepias tuberosa L. | 2192 images |
| Asclepias uncialis Greene | 2 images |
| Asclepias variegata L. | 134 images |
| Asclepias verticillata L. | 186 images |
| Asclepias viridiflora Raf. | 212 images |
| Asclepias viridis Walter | 514 images |
| Asimina triloba (L.) Dunal | 1387 images |
| Asparagus officinalis L. | 3039 images |
| Asperugo procumbens L. | 407 images |
| Asplenium × alternifolium Wulfen | 5 images |
| Asplenium bradleyi D.C.Eaton | 1 images |
| Asplenium montanum Willd. | 22 images |
| Asplenium pinnatifidum Nutt. | 3 images |
| Asplenium platyneuron (L.) Britton, Sterns & Poggenb. | 350 images |
| Asplenium resiliens Kunze | 11 images |
| Asplenium rhizophyllum L. | 79 images |
| Asplenium ruta-muraria L. | 1889 images |
| Asplenium septentrionale (L.) Hoffm. | 398 images |
| Asplenium trichomanes L. | 5748 images |
| Asplenium viride Huds. | 564 images |
| Aster tataricus L.f. | 40 images |
| Astragalus alpinus L. | 339 images |
| Astragalus canadensis L. | 42 images |
| Astragalus cicer L. | 338 images |
| Astragalus crassicarpus Nutt. | 68 images |
| Astragalus lindheimeri Engelm. ex A.Gray | 1 images |
| Astragalus lotiflorus Hook. | 7 images |
| Astragalus missouriensis Nutt. | 40 images |
| Astragalus mollissimus Torr. | 57 images |
| Astragalus nuttallianus DC. | 16 images |
| Astragalus purshii Douglas ex G.Don | 9 images |
| Astragalus racemosus Pursh | 20 images |
| Astragalus tenellus Pursh | 1 images |
| Athyrium filix-femina (L.) Roth | 3568 images |
| Atocion armeria (L.) Raf. | 2692 images |
| Atriplex argentea Nutt. | 3 images |
| Atriplex canescens (Pursh) Nutt. | 155 images |
| Atriplex glabriuscula Edmondston | 86 images |
| Atriplex hortensis L. | 1034 images |
| Atriplex littoralis L. | 287 images |
| Atriplex micrantha Ledeb. | 66 images |
| Atriplex oblongifolia Waldst. & Kit. | 15 images |
| Atriplex patula L. | 701 images |
| Atriplex prostrata Boucher ex DC. | 1283 images |
| Atriplex rosea L. | 38 images |
| Atriplex tatarica L. | 116 images |
| Atropa bella-donna L. | 4030 images |
| Aureolaria flava (L.) Farw. | 50 images |
| Aureolaria grandiflora (Benth.) Pennell | 53 images |
| Aureolaria pectinata (Nutt.) Pennell | 28 images |
| Avena fatua L. | 2466 images |
| Avena sativa L. | 3641 images |
| Avenella flexuosa (L.) Drejer | 434 images |
| Avenula pubescens (Huds.) Dumort. | 109 images |
| Axonopus fissifolius (Raddi) Kuhlm. | 345 images |
| Azolla caroliniana Willd. | 14 images |
| Azolla filiculoides Lam. | 355 images |
| Baccharis halimifolia L. | 1533 images |
| Baccharis salicina Torr. & A.Gray | 23 images |
| Bacopa monnieri (L.) Wettst. | 196 images |
| Bacopa rotundifolia (Michx.) Wettst. | 6 images |
| Ballota nigra L. | 4855 images |
| Baptisia × bicolor Greenm. & Larisey | 12 images |
| Baptisia alba (L.) R.Br. | 116 images |
| Baptisia australis (L.) R.Br. | 983 images |
| Baptisia nuttalliana Small | 48 images |
| Baptisia sphaerocarpa Nutt. | 139 images |
| Baptisia tinctoria (L.) R.Br. | 46 images |
| Barbarea orthoceras Ledeb. | 493 images |
| Barbarea stricta Andrz. ex Besser | 55 images |
| Barbarea verna (Mill.) Asch. | 1431 images |
| Barbarea vulgaris W.T.Aiton | 1019 images |
| Bassia hyssopifolia (Pall.) Kuntze | 33 images |
| Bassia scoparia (L.) A.J.Scott | 398 images |
| Beckmannia syzigachne (Steud.) Fernald | 16 images |
| Bellis perennis L. | 14486 images |
| Berberis canadensis Mill. | 10 images |
| Berberis repens Lindl. | 1697 images |
| Berberis thunbergii DC. | 8614 images |
| Berberis vulgaris L. | 5045 images |
| Berchemia scandens (Hill) K.Koch | 5 images |
| Berlandiera lyrata Benth. | 69 images |
| Berteroa incana (L.) DC. | 4607 images |
| Berula erecta (Huds.) Coville | 771 images |
| Betula alleghaniensis Britton | 237 images |
| Betula cordifolia Regel | 4 images |
| Betula glandulosa Michx. | 7 images |
| Betula nigra L. | 743 images |
| Betula occidentalis Hook. | 40 images |
| Betula papyrifera Marshall | 448 images |
| Betula pendula Roth | 10891 images |
| Betula populifolia Marshall | 60 images |
| Betula pumila L. | 8 images |
| Bidens alba (L.) DC. | 257 images |
| Bidens aristosa (Michx.) Britton | 132 images |
| Bidens bipinnata L. | 1248 images |
| Bidens cernua L. | 469 images |
| Bidens connata Muhl. ex Willd. | 59 images |
| Bidens frondosa L. | 2736 images |
| Bidens pilosa L. | 2850 images |
| Bidens tripartita L. | 1092 images |
| Bidens vulgata Greene | 63 images |
| Bignonia capreolata L. | 527 images |
| Bistorta vivipara (L.) Delarbre | 1161 images |
| Blephilia ciliata (L.) Raf. ex Benth. | 72 images |
| Blephilia hirsuta (Pursh) Benth. | 81 images |
| Bletia spicata (Walter) Sosa & M.W.Chase | 18 images |
| Blitum bonus-henricus (L.) Rchb. | 1419 images |
| Blitum capitatum L. | 200 images |
| Blitum virgatum L. | 119 images |
| Boechera drummondii (A.Gray) Á.Löve & D.Löve | 3 images |
| Boehmeria cylindrica (L.) Sw. | 563 images |
| Boerhavia erecta L. | 180 images |
| Bolboschoenus fluviatilis (Torr.) Soják | 3 images |
| Bolboschoenus maritimus (L.) Palla | 711 images |
| Boltonia asteroides L'Hér. | 3 images |
| Borago officinalis L. | 18984 images |
| Borodinia laevigata (Muhl. ex Willd.) P.J.Alexander & Windham | 4 images |
| Bothriochloa barbinodis (Lag.) Herter | 441 images |
| Bothriochloa bladhii (Retz.) S.T.Blake | 5 images |
| Bothriochloa ischaemum (L.) Keng | 518 images |
| Bothriochloa laguroides (DC.) Herter | 15 images |
| Botrychium dissectum Spreng. | 150 images |
| Botrychium lunaria (L.) Sw. | 484 images |
| Botrychium multifidum (S.G.Gmel.) Rupr. | 2 images |
| Botrychium simplex E.Hitchc. | 48 images |
| Botrychium virginianum (L.) Sw. | 215 images |
| Bouteloua barbata Lag. | 1 images |
| Bouteloua curtipendula (Michx.) Torr. | 114 images |
| Bouteloua gracilis (Kunth) Lag. ex Griffiths | 53 images |
| Bouteloua rigidiseta (Steud.) Hitchc. | 21 images |
| Bouteloua simplex Lag. | 10 images |
| Bowlesia incana Ruiz & Pav. | 325 images |
| Bradburia pilosa (Nutt.) Semple | 9 images |
| Brasenia schreberi J.F.Gmel. | 4 images |
| Brassica juncea (L.) Czern. | 1311 images |
| Brassica napus L. | 9404 images |
| Brassica oleracea L. | 8272 images |
| Brassica rapa L. | 3706 images |
| Brickellia californica (Torr. & A.Gray) A.Gray | 42 images |
| Brickellia eupatorioides (L.) Shinners | 77 images |
| Brickellia grandiflora (Hook.) Nutt. | 8 images |
| Briza maxima L. | 1818 images |
| Briza media L. | 901 images |
| Briza minor L. | 322 images |
| Bromus arvensis L. | 139 images |
| Bromus carinatus Hook. & Arn. | 28 images |
| Bromus catharticus Vahl | 399 images |
| Bromus commutatus Schrad. | 96 images |
| Bromus diandrus Roth | 1303 images |
| Bromus erectus Huds. | 964 images |
| Bromus hordeaceus L. | 2696 images |
| Bromus inermis Leyss. | 664 images |
| Bromus kalmii A.Gray | 1 images |
| Bromus latiglumis (Shear) Hitchc. | 2 images |
| Bromus madritensis L. | 486 images |
| Bromus marginatus Nees ex Steud. | 1 images |
| Bromus pubescens Muhl. ex Willd. | 5 images |
| Bromus racemosus L. | 183 images |
| Bromus rigidus Roth | 14 images |
| Bromus secalinus L. | 229 images |
| Bromus squarrosus L. | 97 images |
| Bromus sterilis L. | 2631 images |
| Bromus tectorum L. | 389 images |
| Broussonetia papyrifera (L.) L'Hér. ex Vent. | 2210 images |
| Brunnera macrophylla (Adams) I.M.Johnst. | 4160 images |
| Brunnichia ovata (Walter) Shinners | 20 images |
| Buddleja davidii Franch. | 16475 images |
| Buglossoides arvensis (L.) I.M.Johnst. | 1124 images |
| Buglossoides incrassata (Guss.) I.M.Johnst. | 27 images |
| Bulbostylis capillaris (L.) Kunth ex C.B.Clarke | 2 images |
| Bunias orientalis L. | 2234 images |
| Bupleurum rotundifolium L. | 460 images |
| Burmannia capitata (Walter ex J.F.Gmel.) Mart. | 161 images |
| Butomus umbellatus L. | 1546 images |
| Cabomba caroliniana A.Gray | 61 images |
| Cakile edentula (Bigelow) Hook. | 232 images |
| Calamagrostis breviligulata (Fernald) Saarela | 49 images |
| Calamagrostis canadensis (Michx.) P.Beauv. | 3 images |
| Calamagrostis epigejos (L.) Roth | 2697 images |
| Calamagrostis purpurea (Trin.) Trin. | 22 images |
| Calamagrostis stricta (Timm) Koeler | 26 images |
| Calendula officinalis L. | 15072 images |
| Calla palustris L. | 1323 images |
| Callicarpa americana L. | 3294 images |
| Callirhoe bushii Fernald | 4 images |
| Callirhoe digitata Nutt. | 126 images |
| Callirhoe involucrata (Torr. & A.Gray) A.Gray | 44 images |
| Callitriche fassettii Schotsman | 2 images |
| Callitriche hermaphroditica L. | 7 images |
| Callitriche heterophylla Pursh | 3 images |
| Callitriche palustris L. | 379 images |
| Callitriche stagnalis Scop. | 619 images |
| Callitriche terrestris Raf. | 5 images |
| Calluna vulgaris (L.) Hull | 8525 images |
| Calochortus gunnisonii S.Watson | 70 images |
| Calochortus nuttallii Torr. | 47 images |
| Calopogon tuberosus (L.) Britton, Sterns & Poggenb. | 72 images |
| Caltha palustris L. | 10406 images |
| Calycanthus floridus L. | 1973 images |
| Calycocarpum lyonii (Pursh) Nutt. ex A.Gray | 1 images |
| Calypso bulbosa (L.) Oakes | 426 images |
| Calystegia hederacea Wall. | 11 images |
| Calystegia sepium (L.) R.Br. | 9350 images |
| Calystegia silvatica (Kit.) Griseb. | 1415 images |
| Calystegia spithamaea (L.) Pursh | 18 images |
| Camassia angusta (Engelm. & A.Gray) Blank. | 5 images |
| Camassia scilloides (Raf.) Cory | 143 images |
| Camelina alyssum (Mill.) Thell. | 3 images |
| Camelina microcarpa Andrz. ex DC. | 99 images |
| Camelina rumelica Velen. | 17 images |
| Camelina sativa (L.) Crantz | 211 images |
| Campanula cervicaria L. | 166 images |
| Campanula glomerata L. | 7118 images |
| Campanula persicifolia L. | 8937 images |
| Campanula rapunculoides L. | 4756 images |
| Campanula trachelium L. | 9279 images |
| Campanulastrum americanum (L.) Small | 280 images |
| Campsis radicans (L.) Bureau | 6688 images |
| Canavalia ensiformis (L.) DC. | 45 images |
| Cannabis sativa L. | 5314 images |
| Capnoides sempervirens (L.) Borkh. | 103 images |
| Capsella bursa-pastoris (L.) Medik. | 9724 images |
| Caragana arborescens Lam. | 1587 images |
| Cardamine bulbosa (Schreb. ex Muhl.) Britton, Sterns & Poggenb. | 24 images |
| Cardamine concatenata (Michx.) O.Schwarz | 370 images |
| Cardamine diphylla (Michx.) Alph.Wood | 60 images |
| Cardamine douglassii Britton | 6 images |
| Cardamine flexuosa With. | 5291 images |
| Cardamine hirsuta L. | 3987 images |
| Cardamine impatiens L. | 1648 images |
| Cardamine parviflora L. | 1879 images |
| Cardamine pensylvanica Muhl. ex Willd. | 4 images |
| Cardamine pratensis L. | 16734 images |
| Cardiospermum halicacabum L. | 1116 images |
| Carduus acanthoides L. | 3277 images |
| Carduus crispus L. | 667 images |
| Carduus nutans L. | 4380 images |
| Carex albolutescens Schwein. | 5 images |
| Carex aquatilis Wahlenb. | 19 images |
| Carex arcta Boott | 6 images |
| Carex atherodes Spreng. | 5 images |
| Carex aurea Nutt. | 14 images |
| Carex blanda Dewey | 31 images |
| Carex bromoides Willd. | 4 images |
| Carex brunnescens (Pers.) Poir. | 41 images |
| Carex bushii Mack. | 3 images |
| Carex buxbaumii Wahlenb. | 71 images |
| Carex canescens L. | 124 images |
| Carex capillaris L. | 51 images |
| Carex careyana Torr. ex Dewey | 6 images |
| Carex caroliniana Schwein. | 1 images |
| Carex cephalophora Muhl. ex Willd. | 18 images |
| Carex cherokeensis Schwein. | 18 images |
| Carex chordorrhiza L.f. | 38 images |
| Carex comosa Boott | 41 images |
| Carex conjuncta Boott | 4 images |
| Carex crinita Lam. | 60 images |
| Carex crus-corvi Shuttlew. ex Kunze | 1 images |
| Carex cryptolepis Mack. | 8 images |
| Carex decomposita Muhl. | 3 images |
| Carex deweyana Schwein. | 7 images |
| Carex diandra Schrank | 75 images |
| Carex disperma Dewey | 3 images |
| Carex eburnea Boott | 25 images |
| Carex echinata Murray | 261 images |
| Carex emoryi Dewey | 8 images |
| Carex festucacea Willd. | 1 images |
| Carex filifolia Nutt. | 8 images |
| Carex flaccosperma Dewey | 20 images |
| Carex flava L. | 271 images |
| Carex folliculata L. | 5 images |
| Carex formosa Dewey | 1 images |
| Carex frankii Kunth | 17 images |
| Carex garberi Fernald | 1 images |
| Carex gracillima Schwein. | 22 images |
| Carex granularis Muhl. ex Willd. | 5 images |
| Carex grayi J.Carey | 257 images |
| Carex grisea Wahlenb. | 17 images |
| Carex hirsutella Mack. | 13 images |
| Carex hirta L. | 774 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. | 30 images |
| Carex inops L.H.Bailey | 1 images |
| Carex intumescens Rudge | 109 images |
| Carex jamesii Schwein. | 8 images |
| Carex lacustris Willd. | 10 images |
| Carex laeviconica Dewey | 3 images |
| Carex laevivaginata (Kük.) Mack. | 1 images |
| Carex lasiocarpa Ehrh. | 51 images |
| Carex laxiflora Lam. | 7 images |
| Carex lenticularis Michx. | 5 images |
| Carex leporina L. | 250 images |
| Carex limosa L. | 113 images |
| Carex livida (Wahlenb.) Willd. | 6 images |
| Carex longii Mack. | 13 images |
| Carex lupuliformis Sartwell ex Dewey | 8 images |
| Carex lupulina Muhl. ex Willd. | 82 images |
| Carex lurida Wahlenb. | 98 images |
| Carex magellanica Lam. | 67 images |
| Carex meadii Dewey | 6 images |
| Carex melanostachya M.Bieb. ex Willd. | 55 images |
| Carex mesochorea Mack. | 2 images |
| Carex michauxiana Boeckeler | 3 images |
| Carex microdonta Torr. | 1 images |
| Carex microptera Mack. | 5 images |
| Carex molesta Mack. | 3 images |
| Carex muehlenbergii Willd. | 3 images |
| Carex muskingumensis Schwein. | 114 images |
| Carex nigromarginata Schwein. | 3 images |
| Carex normalis Mack. | 13 images |
| Carex obtusata Lilj. | 5 images |
| Carex oederi Retz. | 290 images |
| Carex oligosperma Michx. | 8 images |
| Carex pallescens L. | 295 images |
| Carex pauciflora Lightf. | 87 images |
| Carex pedunculata Muhl. ex Willd. | 21 images |
| Carex pensylvanica Lam. | 89 images |
| Carex perdentata S.D.Jones | 2 images |
| Carex planostachys Kunze | 5 images |
| Carex plantaginea Lam. | 165 images |
| Carex platyphylla J.Carey | 3 images |
| Carex prairea Dewey ex Alph.Wood | 2 images |
| Carex praticola Rydb. | 1 images |
| Carex pseudocyperus L. | 447 images |
| Carex radiata (Wahlenb.) Small | 36 images |
| Carex retrorsa Schwein. | 4 images |
| Carex rosea Willd. | 1 images |
| Carex rostrata Stokes | 319 images |
| Carex rupestris All. | 51 images |
| Carex sartwellii Dewey | 4 images |
| Carex scabrata Schwein. | 10 images |
| Carex scirpoidea Michx. | 2 images |
| Carex shortiana Dewey & Torr. | 2 images |
| Carex sparganioides Muhl. ex Willd. | 18 images |
| Carex spicata Huds. | 357 images |
| Carex sprengelii Dewey ex Spreng. | 6 images |
| Carex squarrosa L. | 29 images |
| Carex sterilis Willd. | 3 images |
| Carex stipata Muhl. ex Willd. | 54 images |
| Carex straminea Willd. ex Schkuhr | 1 images |
| Carex stricta Lam. | 46 images |
| Carex supina Willd. ex Wahlenb. | 2 images |
| Carex swanii (Fernald) Mack. | 4 images |
| Carex tenera Dewey | 8 images |
| Carex tenuiflora Wahlenb. | 2 images |
| Carex tetrastachya Scheele | 3 images |
| Carex torta Boott ex Tuck. | 2 images |
| Carex tribuloides Wahlenb. | 16 images |
| Carex trichocarpa Muhl. ex Willd. | 15 images |
| Carex typhina Michx. | 4 images |
| Carex utriculata Boott | 8 images |
| Carex vaginata Tausch | 62 images |
| Carex vallicola Dewey | 2 images |
| Carex vesicaria L. | 285 images |
| Carex virescens Muhl. ex Willd. | 5 images |
| Carex vulpinoidea Michx. | 110 images |
| Carex woodii Dewey | 2 images |
| Carpinus caroliniana Walter | 369 images |
| Carthamus lanatus L. | 1530 images |
| Carthamus tinctorius L. | 922 images |
| Carum carvi L. | 1216 images |
| Carya aquatica (F.Michx.) Nutt. ex Elliott | 14 images |
| Carya cordiformis (Wangenh.) K.Koch | 80 images |
| Carya glabra (Mill.) Sweet | 1981 images |
| Carya illinoinensis (Wangenh.) K.Koch | 799 images |
| Carya laciniosa (F.Michx.) G.Don | 25 images |
| Carya myristiciformis (F.Michx.) Nutt. ex Elliott | 3 images |
| Carya ovata (Mill.) K.Koch | 333 images |
| Carya pallida (Ashe) Engelm. & Graebn. | 21 images |
| Carya tomentosa (Lam.) Nutt. | 99 images |
| Caryopteris incana (Thunb. ex Houtt.) Miq. | 55 images |
| Castanea dentata (Marshall) Borkh. | 685 images |
| Castanea mollissima Blume | 63 images |
| Castanea pumila (L.) Mill. | 55 images |
| Castilleja angustifolia (Nutt.) G.Don | 7 images |
| Castilleja coccinea (L.) Spreng. | 104 images |
| Castilleja indivisa Engelm. | 320 images |
| Castilleja septentrionalis Lindl. | 26 images |
| Castilleja sessiliflora Pursh | 14 images |
| Catabrosa aquatica (L.) P.Beauv. | 71 images |
| Catalpa bignonioides Walter | 13689 images |
| Catalpa ovata G.Don | 1224 images |
| Catalpa speciosa Teas | 454 images |
| Caulophyllum thalictroides (L.) Michx. | 449 images |
| Cayaponia quinqueloba (Raf.) Shinners | 4 images |
| Ceanothus americanus L. | 648 images |
| Ceanothus fendleri A.Gray | 3 images |
| Ceanothus herbaceus Raf. | 31 images |
| Ceanothus velutinus Douglas ex Hook. | 100 images |
| Celastrus orbiculatus Thunb. | 709 images |
| Celastrus scandens L. | 911 images |
| Celosia argentea L. | 9619 images |
| Celtis laevigata Willd. | 538 images |
| Celtis occidentalis L. | 3546 images |
| Celtis tenuifolia Nutt. | 37 images |
| Cenchrus alopecuroides (L.) Thunb. | 591 images |
| Cenchrus americanus (L.) Morrone | 115 images |
| Cenchrus ciliaris L. | 480 images |
| Cenchrus echinatus L. | 123 images |
| Cenchrus latifolius (Spreng.) Morrone | 8 images |
| Cenchrus longispinus (Hack.) Fernald | 80 images |
| Cenchrus petiolaris (Hochst.) Morrone | 1 images |
| Cenchrus spinifex Cav. | 30 images |
| Centaurea benedicta (L.) L. | 336 images |
| Centaurea calcitrapa L. | 1652 images |
| Centaurea cyanus L. | 15919 images |
| Centaurea diffusa Lam. | 192 images |
| Centaurea diluta Aiton | 27 images |
| Centaurea iberica Trevir. ex Spreng. | 52 images |
| Centaurea jacea L. | 13823 images |
| Centaurea macrocephala Muss.Puschk. ex Willd. | 440 images |
| Centaurea melitensis L. | 757 images |
| Centaurea montana L. | 8918 images |
| Centaurea nigra L. | 7763 images |
| Centaurea nigrescens Willd. | 699 images |
| Centaurea phrygia L. | 422 images |
| Centaurea scabiosa L. | 8047 images |
| Centaurea solstitialis L. | 1245 images |
| Centaurea stoebe L. | 751 images |
| Centaurium pulchellum (Sw.) Hayek ex Hand.-Mazz., Stadlm., Janch. & Faltis | 46 images |
| Centrosema virginianum (L.) Benth. | 502 images |
| Cephalanthus occidentalis L. | 1231 images |
| Cephalaria gigantea (Ledeb.) Bobrov | 543 images |
| Cerastium arvense L. | 5005 images |
| Cerastium brachypetalum Desp. ex Pers. | 63 images |
| Cerastium diffusum Pers. | 142 images |
| Cerastium glomeratum Thuill. | 4525 images |
| Cerastium holosteoides Fr. | 10 images |
| Cerastium nutans Raf. | 7 images |
| Cerastium pumilum Curtis | 409 images |
| Cerastium semidecandrum L. | 478 images |
| Cerastium tomentosum L. | 6197 images |
| Ceratophyllum demersum L. | 295 images |
| Cercis canadensis L. | 6246 images |
| Cercocarpus montanus Raf. | 186 images |
| Cevallia sinuata Lag. | 8 images |
| Chaenomeles japonica (Thunb.) Lindl. ex Spach | 10085 images |
| Chaenomeles speciosa (Sweet) Nakai | 7030 images |
| Chaenorhinum minus (L.) Lange | 641 images |
| Chaerophyllum procumbens (L.) Crantz | 15 images |
| Chaerophyllum tainturieri Hook. & Arn. | 210 images |
| Chaiturus marrubiastrum (L.) Ehrh. ex Rchb. | 73 images |
| Chamaecrista fasciculata (Michx.) Greene | 823 images |
| Chamaecrista nictitans (L.) Moench | 209 images |
| Chamaedaphne calyculata (L.) Moench | 156 images |
| Chamaelirium luteum (L.) A.Gray | 45 images |
| Chamaemelum nobile (L.) All. | 2564 images |
| Chamaerhodos erecta (L.) Bunge | 1 images |
| Chasmanthium latifolium (Michx.) H.O.Yates | 399 images |
| Chelidonium majus L. | 25433 images |
| Chelone glabra L. | 441 images |
| Chelone obliqua L. | 212 images |
| Chenopodiastrum murale (L.) S.Fuentes, Uotila & Borsch | 1382 images |
| Chenopodium album L. | 14582 images |
| Chenopodium berlandieri Moq. | 46 images |
| Chenopodium betaceum Andrz. | 5 images |
| Chenopodium ficifolium Sm. | 1323 images |
| Chenopodium opulifolium Schrad. ex W.D.J.Koch & Ziz | 6 images |
| Chenopodium pratericola Rydb. | 17 images |
| Chenopodium standleyanum Aellen | 3 images |
| Chenopodium vulvaria L. | 782 images |
| Chimaphila maculata (L.) Pursh | 750 images |
| Chimaphila umbellata (L.) W.P.C.Barton | 120 images |
| Chionanthus virginicus L. | 652 images |
| Chloracantha spinosa (Benth.) G.L.Nesom | 5 images |
| Chloris cucullata Bisch. | 5 images |
| Chloris gayana Kunth | 119 images |
| Chloris verticillata Nutt. | 31 images |
| Chloris virgata Sw. | 65 images |
| Chondrilla juncea L. | 1897 images |
| Chorispora tenella (Pall.) DC. | 215 images |
| Chrysosplenium americanum Schwein. ex Hook. | 24 images |
| Cichorium intybus L. | 19251 images |
| Cicuta bulbifera L. | 34 images |
| Cicuta maculata L. | 310 images |
| Cinna arundinacea L. | 15 images |
| Circaea alpina L. | 253 images |
| Circaea canadensis (L.) Hill | 20 images |
| Cirsium altissimum (L.) Spreng. | 255 images |
| Cirsium arvense (L.) Scop. | 15251 images |
| Cirsium discolor (Muhl. ex Willd.) Spreng. | 198 images |
| Cirsium flodmanii Arthur | 9 images |
| Cirsium horridulum Michx. | 253 images |
| Cirsium muticum Michx. | 69 images |
| Cirsium ochrocentrum A.Gray | 4 images |
| Cirsium palustre (L.) Scop. | 3906 images |
| Cirsium texanum Buckley | 231 images |
| Cirsium undulatum Spreng. | 121 images |
| Cirsium vulgare (Savi) Ten. | 19774 images |
| Cissus trifoliata (L.) L. | 10 images |
| Citrullus lanatus (Thunb.) Matsum. & Nakai | 2224 images |
| Citrus trifoliata L. | 2510 images |
| Cladium mariscoides (Muhl.) Torr. | 3 images |
| Cladrastis kentukea (Dum.Cours.) Rudd | 327 images |
| Clarkia pulchella Pursh | 50 images |
| Claytonia caroliniana Michx. | 305 images |
| Claytonia rubra (Howell) Tidestr. | 68 images |
| Claytonia virginica L. | 1204 images |
| Clematis columbiana (Nutt.) Torr. & A.Gray | 3 images |
| Clematis crispa L. | 96 images |
| Clematis fremontii S.Watson | 4 images |
| Clematis hirsutissima Pursh | 33 images |
| Clematis integrifolia L. | 684 images |
| Clematis ligusticifolia Nutt. | 88 images |
| Clematis occidentalis (Hornem.) DC. | 50 images |
| Clematis pitcheri Torr. & A.Gray | 3 images |
| Clematis terniflora DC. | 893 images |
| Clematis versicolor Small | 4 images |
| Clematis viorna L. | 76 images |
| Clematis virginiana L. | 812 images |
| Cleome dodecandra L. | 139 images |
| Cleome erosa (Nutt.) Eaton | 3 images |
| Cleome gynandra L. | 428 images |
| Cleome houtteana Schltdl. | 2419 images |
| Cleome spinosa Jacq. | 1026 images |
| Cleomella lutea (Hook.) Roalson & J.C.Hall | 18 images |
| Cleomella serrulata (Pursh) Roalson & J.C.Hall | 71 images |
| Clinopodium acinos (L.) Kuntze | 621 images |
| Clinopodium arkansanum (Nutt.) House | 1 images |
| Clinopodium nepeta (L.) Kuntze | 5977 images |
| Clinopodium vulgare L. | 7332 images |
| Clintonia borealis (Aiton) Raf. | 685 images |
| Clitoria mariana L. | 128 images |
| Cnidoscolus texanus (Müll.Arg.) Small | 1 images |
| Cocculus carolinus (L.) DC. | 340 images |
| Coleataenia anceps (Michx.) Soreng | 3 images |
| Collinsia heterophylla Buist ex Graham | 5 images |
| Collinsia parviflora Douglas ex Lindl. | 41 images |
| Collinsia verna Nutt. | 71 images |
| Collinsia violacea Nutt. | 11 images |
| Collinsonia canadensis L. | 114 images |
| Collomia linearis Nutt. | 35 images |
| Comandra umbellata (L.) Nutt. | 87 images |
| Comarum palustre L. | 1003 images |
| Commelina caroliniana Walter | 8 images |
| Commelina communis L. | 1985 images |
| Commelina diffusa Burm.f. | 504 images |
| Commelina erecta L. | 1770 images |
| Commelina virginica L. | 52 images |
| Comptonia peregrina (L.) Coult. | 189 images |
| Conium maculatum L. | 7627 images |
| Conoclinium coelestinum DC. | 1122 images |
| Conopholis americana (L.) Wallr. | 315 images |
| Conringia orientalis (L.) C.Presl | 2 images |
| Convallaria majalis L. | 7171 images |
| Convolvulus arvensis L. | 16231 images |
| Convolvulus equitans Benth. | 143 images |
| Coptis trifolia (L.) Salisb. | 249 images |
| Corallorhiza maculata Raf. | 311 images |
| Corallorhiza odontorhiza (Willd.) Nutt. | 1 images |
| Corallorhiza striata Lindl. | 132 images |
| Corallorhiza trifida Châtel. | 159 images |
| Corallorhiza wisteriana Conrad | 33 images |
| Coreopsis grandiflora Hogg ex Sweet | 2489 images |
| Coreopsis lanceolata L. | 2669 images |
| Coreopsis palmata Nutt. | 64 images |
| Coreopsis pubescens Elliott | 22 images |
| Coreopsis tinctoria Nutt. | 3047 images |
| Coreopsis tripteris L. | 160 images |
| Coriandrum sativum L. | 3130 images |
| Corispermum americanum (Nutt.) Nutt. | 2 images |
| Corispermum pallasii Steven | 103 images |
| Cornus alba L. | 4065 images |
| Cornus alternifolia L.f. | 267 images |
| Cornus amomum Mill. | 565 images |
| Cornus canadensis L. | 1338 images |
| Cornus drummondii C.A.Mey. | 16 images |
| Cornus florida L. | 5606 images |
| Cornus foemina Mill. | 37 images |
| Cornus mas L. | 11263 images |
| Cornus racemosa Lam. | 442 images |
| Cornus rugosa Lam. | 173 images |
| Cornus sericea L. | 7027 images |
| Coronilla varia L. | 8731 images |
| Corydalis aurea Willd. | 95 images |
| Corydalis flavula (Raf.) DC. | 96 images |
| Corylus americana Walter | 65 images |
| Corylus cornuta Marshall | 1154 images |
| Cosmos bipinnatus Cav. | 12883 images |
| Cosmos parviflorus (Jacq.) Pers. | 30 images |
| Cosmos sulphureus Cav. | 3939 images |
| Cota tinctoria (L.) J.Gay | 1831 images |
| Cotinus coggygria Scop. | 13022 images |
| Cotinus obovatus Raf. | 330 images |
| Cotoneaster acutifolius Turcz. | 772 images |
| Cotoneaster divaricatus Rehder & E.H.Wilson | 510 images |
| Cotoneaster multiflorus Bunge | 366 images |
| Crassula aquatica (L.) Schönland | 7 images |
| Crataegus atrorubens Ashe | 2 images |
| Crataegus calpodendron (Ehrh.) Medik. | 10 images |
| Crataegus chrysocarpa Ashe | 6 images |
| Crataegus coccinea L. | 169 images |
| Crataegus coccinioides Ashe | 19 images |
| Crataegus collina Chapm. | 4 images |
| Crataegus crus-galli L. | 638 images |
| Crataegus douglasii Lindl. | 381 images |
| Crataegus fluviatilis Sarg. | 2 images |
| Crataegus holmesiana Ashe | 25 images |
| Crataegus intricata Lange | 8 images |
| Crataegus irrasa Sarg. | 3 images |
| Crataegus macracantha Lodd. ex Loudon | 7 images |
| Crataegus macrosperma Ashe | 9 images |
| Crataegus magniflora Sarg. | 3 images |
| Crataegus marshallii Eggl. | 85 images |
| Crataegus mollis (Torr. & A.Gray) Scheele | 30 images |
| Crataegus monogyna Jacq. | 24916 images |
| Crataegus nitida (Engelm. ex Britton & N.E.Br.) Sarg. | 4 images |
| Crataegus phaenopyrum (L.f.) Medik. | 192 images |
| Crataegus pruinosa (H.L.Wendl.) K.Koch | 9 images |
| Crataegus punctata Jacq. | 73 images |
| Crataegus scabrida Sarg. | 5 images |
| Crataegus submollis Sarg. | 192 images |
| Crataegus succulenta Schrad. ex Link | 14 images |
| Crataegus uniflora Münchh. | 16 images |
| Crataegus viridis L. | 29 images |
| Crepis acuminata Nutt. | 42 images |
| Crepis capillaris (L.) Wallr. | 9042 images |
| Crepis foetida L. | 1914 images |
| Crepis occidentalis Nutt. | 45 images |
| Crepis pulchra L. | 824 images |
| Crepis setosa Haller f. | 2361 images |
| Crepis tectorum L. | 249 images |
| Cressa truxillensis Kunth | 19 images |
| Crocanthemum bicknellii (Fernald) Janch. | 3 images |
| Crocanthemum georgianum (Chapm.) Barnhart | 6 images |
| Crocanthemum rosmarinifolium (Pursh) Janch. | 2 images |
| Croptilon divaricatum (Nutt.) Raf. | 9 images |
| Crotalaria sagittalis L. | 55 images |
| Crotalaria spectabilis Roth | 159 images |
| Croton capitatus Michx. | 208 images |
| Croton glandulosus L. | 73 images |
| Croton monanthogynus Michx. | 106 images |
| Cruciata pedemontana (Bellardi) Ehrend. | 122 images |
| Cryptantha minima Rydb. | 7 images |
| Cryptotaenia canadensis (L.) DC. | 233 images |
| Cucumis melo L. | 4732 images |
| Cucumis sativus L. | 4657 images |
| Cucurbita foetidissima Kunth | 259 images |
| Cucurbita maxima Duchesne | 4888 images |
| Cucurbita pepo L. | 5117 images |
| Cunila origanoides (L.) Britton | 49 images |
| Cuphea viscosissima Jacq. | 47 images |
| Cuscuta approximata Bab. | 35 images |
| Cuscuta campestris Yunck. | 578 images |
| Cuscuta cephalanthi Engelm. | 3 images |
| Cuscuta compacta Juss. ex Choisy | 1 images |
| Cuscuta epithymum (L.) L. | 1087 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. | 96 images |
| Cyclospermum leptophyllum (Pers.) Sprague ex Britton & P.Wilson | 373 images |
| Cydonia oblonga Mill. | 9929 images |
| Cylindropuntia davisii (Engelm. & J.M.Bigelow) F.M.Knuth | 4 images |
| Cylindropuntia imbricata (Haw.) F.M.Knuth | 416 images |
| Cylindropuntia leptocaulis (DC.) F.M.Knuth | 33 images |
| Cymbalaria muralis G.Gaertn., B.Mey. & Scherb. | 1411 images |
| Cymopterus glomeratus (Nutt.) DC. | 2 images |
| Cynanchum laeve (Michx.) Pers. | 178 images |
| Cynanchum rostellatum (Turcz.) Liede & Khanum | 20 images |
| Cynodon dactylon (L.) Pers. | 2432 images |
| Cynoglossum amabile Stapf & J.R.Drumm. | 779 images |
| Cynoglossum creticum Mill. | 3510 images |
| Cynoglossum officinale L. | 3007 images |
| Cynosurus cristatus L. | 634 images |
| Cynosurus echinatus L. | 542 images |
| Cyperus bipartitus Torr. | 6 images |
| Cyperus brevifolius (Rottb.) Hassk. | 143 images |
| Cyperus compressus L. | 43 images |
| Cyperus difformis L. | 107 images |
| Cyperus esculentus L. | 801 images |
| Cyperus flavescens L. | 58 images |
| Cyperus fuscus L. | 313 images |
| Cyperus granitophilus McVaugh | 1 images |
| Cyperus hortensis (Salzm. ex Steud.) Dorr | 137 images |
| Cyperus iria L. | 43 images |
| Cyperus lupulinus (Biehler) Marcks | 2 images |
| Cyperus odoratus L. | 112 images |
| Cyperus polystachyos Rottb. | 16 images |
| Cyperus pseudovegetus Steud. | 5 images |
| Cyperus reflexus Vahl | 3 images |
| Cyperus rotundus L. | 921 images |
| Cyperus sesquiflorus (Torr.) Mattf. & Kük. | 28 images |
| Cyperus squarrosus L. | 25 images |
| Cyperus strigosus L. | 280 images |
| Cyperus subsquarrosus (Muhl.) Bauters | 160 images |
| Cyperus surinamensis Rottb. | 21 images |
| Cypripedium acaule Aiton | 832 images |
| Cypripedium candidum Muhl. ex Willd. | 44 images |
| Cypripedium kentuckiense C.F.Reed | 1 images |
| Cypripedium parviflorum Salisb. | 297 images |
| Cypripedium reginae Walter | 195 images |
| Cystopteris × tennesseensis Shaver | 13 images |
| Cystopteris bulbifera (L.) Bernh. | 89 images |
| Cystopteris fragilis (L.) Bernh. | 1040 images |
| Cystopteris protrusa (Weath.) Blasdell | 40 images |
| Cystopteris tenuis (Michx.) Desv. | 3 images |
| Dactylis glomerata L. | 9488 images |
| Dactyloctenium aegyptium (L.) Willd. | 389 images |
| Dactylorhiza viridis (L.) R.M.Bateman, Pridgeon & M.W.Chase | 729 images |
| Dalea candida Willd. | 9 images |
| Dalea compacta Spreng. | 16 images |
| Dalea cylindriceps Barneby | 6 images |
| Dalea formosa Torr. | 63 images |
| Dalea jamesii (Torr.) Torr. & A.Gray | 2 images |
| Dalea lanata Spreng. | 4 images |
| Dalea leporina (Aiton) Bullock | 22 images |
| Dalea multiflora (Nutt.) Shinners | 14 images |
| Dalea purpurea Vent. | 224 images |
| Dalea villosa (Nutt.) Spreng. | 3 images |
| Dalibarda repens L. | 24 images |
| Danthonia californica Bol. | 18 images |
| Danthonia compressa Austin | 3 images |
| Danthonia intermedia Vasey | 2 images |
| Danthonia unispicata (Thurb.) Munro ex Macoun | 21 images |
| Dasiphora fruticosa (L.) Rydb. | 6042 images |
| Dasistoma macrophylla (Nutt.) Raf. | 51 images |
| Datura innoxia Mill. | 1479 images |
| Datura stramonium L. | 14081 images |
| Datura wrightii Regel | 1234 images |
| Daucus carota L. | 24288 images |
| Daucus pusillus Michx. | 193 images |
| Decodon verticillatus (L.) Elliott | 48 images |
| Delphinium ajacis L. | 5636 images |
| Delphinium bicolor Nutt. | 9 images |
| Delphinium carolinianum Walter | 151 images |
| Delphinium consolida L. | 2379 images |
| Delphinium elatum L. | 4282 images |
| Delphinium exaltatum Aiton | 16 images |
| Delphinium hispanicum Willk. ex Costa | 20 images |
| Delphinium pubescens DC. | 61 images |
| Delphinium tricorne Michx. | 207 images |
| Dennstaedtia punctilobula (Michx.) T.Moore | 2 images |
| Deparia acrostichoides (Sw.) M.Kato | 48 images |
| Deschampsia cespitosa (L.) P.Beauv. | 424 images |
| Descurainia pinnata (Walter) Britton | 160 images |
| Descurainia sophia (L.) Webb ex Prantl | 735 images |
| Desmanthus illinoensis (Michx.) MacMill. ex B.L.Rob. & Fernald | 86 images |
| Desmodium canadense (L.) DC. | 187 images |
| Desmodium canescens (L.) DC. | 7 images |
| Desmodium glabellum (Michx.) DC. | 7 images |
| Desmodium illinoense A.Gray | 2 images |
| Desmodium paniculatum (L.) DC. | 481 images |
| Desmodium tweedyi Britton | 7 images |
| Deutzia crenata Siebold & Zucc. | 209 images |
| Dianthera americana L. | 178 images |
| Dianthus armeria L. | 2205 images |
| Dianthus barbatus L. | 10319 images |
| Dianthus carthusianorum L. | 5898 images |
| Dianthus deltoides L. | 3739 images |
| Dianthus plumarius L. | 1374 images |
| Diaperia prolifera (Nutt. ex DC.) Nutt. | 1 images |
| Diaperia verna (Raf.) Morefield | 8 images |
| Dicentra canadensis (Goldie) Walp. | 151 images |
| Dicentra cucullaria (L.) Bernh. | 642 images |
| Dicentra eximia (Ker Gawl.) Torr. | 98 images |
| Dichanthelium clandestinum (L.) Gould | 150 images |
| Dichanthelium latifolium (L.) Harvill | 2 images |
| Dichanthelium oligosanthes (Schult.) Gould | 29 images |
| Dichanthelium sabulorum (Lam.) Gould & C.A.Clark | 1 images |
| Dichanthelium scribnerianum (Nash) J.R.Thomas | 2 images |
| Dichodon viscidum (M.Bieb.) Holub | 39 images |
| Dichondra carolinensis Michx. | 210 images |
| Dicliptera brachiata Spreng. | 69 images |
| Diervilla lonicera Mill. | 547 images |
| Dieteria canescens (Pursh) Nutt. | 68 images |
| Digitalis grandiflora Mill. | 2266 images |
| Digitalis lanata Ehrh. | 180 images |
| Digitalis purpurea L. | 20223 images |
| Digitaria bicornis (Lam.) Roem. & Schult. | 4 images |
| Digitaria californica (Benth.) Henrard | 4 images |
| Digitaria ciliaris (Retz.) Koeler | 197 images |
| Digitaria filiformis (L.) Koeler | 5 images |
| Digitaria insularis (L.) Mez ex Ekman | 29 images |
| Digitaria ischaemum (Schreb.) Muhl. | 48 images |
| Digitaria sanguinalis (L.) Scop. | 2150 images |
| Digitaria violascens Link | 12 images |
| Dimorphocarpa candicans (Raf.) Rollins | 4 images |
| Diodia virginiana L. | 370 images |
| Dioscorea polystachya Turcz. | 37 images |
| Dioscorea villosa L. | 276 images |
| Diospyros virginiana L. | 2198 images |
| Diplachne fusca (L.) P.Beauv. ex Roem. & Schult. | 44 images |
| Diplotaxis muralis (L.) DC. | 815 images |
| Diplotaxis tenuifolia (L.) DC. | 5543 images |
| Dipsacus fullonum L. | 12933 images |
| Dipsacus laciniatus L. | 837 images |
| Dirca palustris L. | 73 images |
| Distichlis spicata (L.) Greene | 90 images |
| Doellingeria umbellata (Mill.) Nees | 433 images |
| Draba glabella Pursh | 7 images |
| Draba incana L. | 27 images |
| Draba nemorosa L. | 83 images |
| Draba verna L. | 2693 images |
| Dracocephalum parviflorum Nutt. | 28 images |
| Drosera × obovata Mert. & W.D.J.Koch | 31 images |
| Drosera anglica Huds. | 276 images |
| Drosera brevifolia Pursh | 68 images |
| Drosera intermedia Hayne | 407 images |
| Drosera linearis Goldie | 14 images |
| Drosera rotundifolia L. | 1434 images |
| Drymocallis arguta (Pursh) Rydb. | 7 images |
| Dryopteris × boottii (Tuck.) Underw. | 4 images |
| Dryopteris × uliginosa (A.Braun ex Döll) Kuntze ex Druce | 1 images |
| Dryopteris carthusiana (Vill.) H.P.Fuchs | 680 images |
| Dryopteris clintoniana (D.C.Eaton) Dowell | 2 images |
| Dryopteris cristata (L.) A.Gray | 221 images |
| Dryopteris expansa (C.Presl) Fraser-Jenk. & Jermy | 101 images |
| Dryopteris filix-mas (L.) Schott | 6099 images |
| Dryopteris fragrans (L.) Schott | 31 images |
| Dryopteris goldieana (Hook. ex Goldie) A.Gray | 12 images |
| Dryopteris intermedia A.Gray | 11 images |
| Dryopteris marginalis (L.) A.Gray | 4 images |
| Dulichium arundinaceum (L.) Britton | 35 images |
| Dyschoriste linearis (Torr. & A.Gray) Kuntze | 32 images |
| Dysphania ambrosioides (L.) Mosyakin & Clemants | 1225 images |
| Dysphania anthelmintica (L.) Mosyakin & Clemants | 1 images |
| Dysphania atriplicifolia (Spreng.) G.Kadereit, Sukhor. & Uotila | 59 images |
| Dysphania botrys (L.) Mosyakin & Clemants | 104 images |
| Dysphania pumilio (R.Br.) Mosyakin & Clemants | 237 images |
| Dyssodia papposa (Vent.) Hitchc. | 23 images |
| Echinacea angustifolia DC. | 1373 images |
| Echinacea pallida (Nutt.) Nutt. | 659 images |
| Echinacea paradoxa Britton | 7 images |
| Echinacea purpurea (L.) Moench | 6182 images |
| Echinacea sanguinea Nutt. | 10 images |
| Echinacea simulata McGregor | 4 images |
| Echinocactus texensis Hopffer | 217 images |
| Echinocereus reichenbachii (Terscheck) Haage | 25 images |
| Echinocereus viridiflorus Engelm. | 94 images |
| Echinochloa colonum (L.) Link | 201 images |
| Echinochloa crus-galli (L.) P.Beauv. | 2490 images |
| Echinochloa frumentacea Link | 13 images |
| Echinochloa muricata (P.Beauv.) Fernald | 40 images |
| Echinochloa walteri (Pursh) A.Heller | 1 images |
| Echinocystis lobata (Michx.) Torr. & A.Gray | 718 images |
| Echinodorus berteroi (Spreng.) Fassett | 12 images |
| Echinops exaltatus Schrad. | 224 images |
| Echinops sphaerocephalus L. | 2880 images |
| Echium vulgare L. | 31042 images |
| Eclipta prostrata (L.) L. | 1259 images |
| Elaeagnus angustifolia L. | 4743 images |
| Elaeagnus commutata Bernh. ex Rydb. | 193 images |
| Elaeagnus multiflora Thunb. | 189 images |
| Elaeagnus umbellata Thunb. | 2459 images |
| Elatine rubella Rydb. | 6 images |
| Elatine triandra Schkuhr | 39 images |
| Eleocharis acicularis (L.) Roem. & Schult. | 51 images |
| Eleocharis atropurpurea (Retz.) J.Presl & C.Presl | 4 images |
| Eleocharis compressa Sull. | 16 images |
| Eleocharis erythropoda Steud. | 5 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 obtusa (Willd.) Schult. | 31 images |
| Eleocharis ovata (Roth) Roem. & Schult. | 42 images |
| Eleocharis palustris (L.) Roem. & Schult. | 598 images |
| Eleocharis parvula (Roem. & Schult.) Link ex Bluff, Nees & Schauer | 40 images |
| Eleocharis quinqueflora (Hartmann) O.Schwarz | 50 images |
| Eleocharis uniglumis (Link) Schult. | 26 images |
| Elephantopus carolinianus Raeusch. | 40 images |
| Elephantopus tomentosus L. | 23 images |
| Eleusine indica (L.) Gaertn. | 828 images |
| Eleusine tristachya (Lam.) Lam. | 136 images |
| Eleutherococcus sieboldianus (Makino) Koidz. | 8 images |
| Ellisia nyctelea (L.) L. | 51 images |
| Elodea canadensis Michx. | 217 images |
| Elodea densa (Planch.) Casp. | 112 images |
| Elodea nuttallii (Planch.) H.St.John | 71 images |
| Elsholtzia ciliata (Thunb.) Hyl. | 48 images |
| Elymus canadensis L. | 116 images |
| Elymus elymoides (Raf.) Swezey | 21 images |
| Elymus glaucus Buckley | 13 images |
| Elymus hystrix L. | 46 images |
| Elymus repens (L.) Gould | 540 images |
| Elymus riparius Wiegand | 4 images |
| Elymus villosus Muhl. ex Willd. | 6 images |
| Elymus violaceus (Hornem.) J.Feilberg | 8 images |
| Elymus virginicus L. | 45 images |
| Empetrum nigrum L. | 1109 images |
| Enemion biternatum Raf. | 6 images |
| Engelmannia peristenia (Raf.) Goodman & C.A.Lawson | 17 images |
| Enneapogon desvauxii P.Beauv. | 7 images |
| Epifagus virginiana (L.) Barton | 102 images |
| Epigaea repens L. | 166 images |
| Epilobium angustifolium L. | 16335 images |
| Epilobium brachycarpum C.Presl | 248 images |
| Epilobium ciliatum Raf. | 4005 images |
| Epilobium coloratum Biehler | 52 images |
| Epilobium hallianum Hausskn. | 1 images |
| Epilobium hirsutum L. | 12256 images |
| Epilobium hornemannii Rchb. | 23 images |
| Epilobium latifolium L. | 74 images |
| Epilobium leptophyllum Raf. | 8 images |
| Epilobium palustre L. | 356 images |
| Epilobium parviflorum Schreb. | 3403 images |
| Epipactis gigantea Douglas | 171 images |
| Epipactis helleborine (L.) Crantz | 5854 images |
| Equisetum × ferrissii Clute | 1 images |
| Equisetum × litorale Kühlew. ex Rupr. | 15 images |
| Equisetum arvense L. | 5977 images |
| Equisetum fluviatile L. | 758 images |
| Equisetum laevigatum A.Braun & Engelm. | 67 images |
| Equisetum palustre L. | 834 images |
| Equisetum pratense Ehrh. | 356 images |
| Equisetum scirpoides Michx. | 73 images |
| Equisetum sylvaticum L. | 2133 images |
| Equisetum variegatum Schleich. ex F.Weber & D.Mohr | 94 images |
| Eragrostis barrelieri Daveau | 59 images |
| Eragrostis cilianensis (All.) Vignolo ex Janch. | 85 images |
| Eragrostis curvula (Schrad.) Nees | 60 images |
| Eragrostis hypnoides (Lam.) Britton, Sterns & Poggenb. | 5 images |
| Eragrostis japonica (Thunb.) Trin. | 5 images |
| Eragrostis lehmanniana Nees | 4 images |
| Eragrostis mexicana (Hornem.) Link | 27 images |
| Eragrostis minor Host | 260 images |
| Eragrostis pectinacea (Michx.) Nees | 27 images |
| Eragrostis pilosa (L.) P.Beauv. | 51 images |
| Eragrostis spectabilis (Pursh) Steud. | 163 images |
| Eranthis hyemalis (L.) Salisb. | 4140 images |
| Erechtites hieraciifolius (L.) Raf. ex DC. | 1471 images |
| Eremopyrum triticeum (Gaertn.) Nevski | 10 images |
| Erianthus alopecuroides (L.) Elliott | 20 images |
| Erianthus giganteus (Walter) P.Beauv. | 3 images |
| Erigenia bulbosa (Michx.) Nutt. | 72 images |
| Erigeron annuus (L.) Desf | 199 images |
| Erigeron caespitosus Nutt. | 3 images |
| Erigeron canadensis L. | 12936 images |
| Erigeron compositus Pursh | 34 images |
| Erigeron divaricatus Michx. | 22 images |
| Erigeron divergens Torr. & A.Gray | 8 images |
| Erigeron flagellaris A.Gray | 2 images |
| Erigeron formosissimus Greene | 5 images |
| Erigeron glabellus Nutt. | 108 images |
| Erigeron lonchophyllus Hook. | 13 images |
| Erigeron modestus A.Gray | 6 images |
| Erigeron philadelphicus L. | 2927 images |
| Erigeron pulchellus Michx. | 204 images |
| Erigeron pumilus Nutt. | 61 images |
| Erigeron speciosus (Lindl.) DC. | 853 images |
| Erigeron strigosus Muhl. ex Willd. | 3914 images |
| Erigeron vetensis Rydb. | 4 images |
| Eriocaulon aquaticum (Hill) Druce | 25 images |
| Eriochloa villosa (Thunb.) Kunth | 6 images |
| Eriocoma nelsonii (Scribn.) Romasch. | 1 images |
| Eriogonum alatum Torr. | 9 images |
| Eriogonum annuum Nutt. | 14 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. | 8 images |
| Eriogonum multiflorum Benth. | 16 images |
| Eriogonum tenellum Torr. | 4 images |
| Erioneuron pilosum (Buckley) Nash | 10 images |
| Eriophorum angustifolium Honck. | 2174 images |
| Eriophorum vaginatum L. | 795 images |
| Eriophorum virginicum L. | 16 images |
| Eriophorum viridicarinatum (Engelm.) Fernald | 2 images |
| Erodium cicutarium (L.) L'Hér. | 12739 images |
| Eruca vesicaria (L.) Cav. | 3909 images |
| Erucastrum gallicum (Willd.) O.E.Schulz | 296 images |
| Eryngium aquaticum L. | 16 images |
| Eryngium hookeri Walp. | 12 images |
| Eryngium integrifolium Walter | 5 images |
| Eryngium leavenworthii Torr. & A.Gray | 123 images |
| Eryngium planum L. | 1902 images |
| Eryngium prostratum Nutt. ex DC. | 12 images |
| Eryngium yuccifolium Michx. | 420 images |
| Erysimum asperum (Nutt.) DC. | 96 images |
| Erysimum capitatum (Douglas) Greene | 11 images |
| Erysimum cheiranthoides L. | 1109 images |
| Erysimum repandum L. | 54 images |
| Erysimum virgatum Roth | 106 images |
| Erythranthe floribunda (Lindl.) G.L.Nesom | 9 images |
| Erythranthe guttata (DC.) G.L.Nesom | 828 images |
| Erythranthe moschata (Douglas ex Lindl.) G.L.Nesom | 9 images |
| Erythronium albidum Nutt. | 206 images |
| Erythronium americanum Ker Gawl. | 1398 images |
| Erythronium propullans A.Gray | 1 images |
| Erythronium rostratum W.Wolf | 13 images |
| Eschscholzia californica Cham. | 13556 images |
| Escobaria missouriensis (Sweet) D.R.Hunt | 14 images |
| Escobaria vivipara (Nutt.) Buxb. | 87 images |
| Euonymus alatus (Thunb.) Siebold | 2921 images |
| Euonymus americanus L. | 407 images |
| Euonymus atropurpureus Jacq. | 109 images |
| Euonymus europaeus L. | 18948 images |
| Euonymus fortunei (Turcz.) Hand.-Mazz. | 5966 images |
| Euonymus hamiltonianus Wall. | 87 images |
| Euonymus japonicus Thunb. | 6953 images |
| Euonymus maackii Rupr. | 45 images |
| Eupatorium altissimum L. | 113 images |
| Eupatorium capillifolium (Lam.) Small ex Porter & Britton | 460 images |
| Eupatorium hyssopifolium L. | 41 images |
| Eupatorium perfoliatum L. | 861 images |
| Eupatorium rotundifolium L. | 34 images |
| Eupatorium serotinum Michx. | 891 images |
| Eupatorium sessilifolium L. | 6 images |
| Euphorbia agraria M.Bieb. | 5 images |
| Euphorbia albomarginata Torr. & A.Gray | 30 images |
| Euphorbia corollata L. | 196 images |
| Euphorbia cyparissias L. | 15386 images |
| Euphorbia davidii Subils | 37 images |
| Euphorbia dentata Michx. | 17 images |
| Euphorbia glyptosperma Engelm. | 36 images |
| Euphorbia helioscopia L. | 8597 images |
| Euphorbia heterophylla L. | 974 images |
| Euphorbia hirta L. | 1059 images |
| Euphorbia hypericifolia L. | 1686 images |
| Euphorbia lathyris L. | 8686 images |
| Euphorbia maculata L. | 726 images |
| Euphorbia marginata Pursh | 1353 images |
| Euphorbia myrsinites L. | 2111 images |
| Euphorbia nutans Lag. | 358 images |
| Euphorbia ophthalmica Pers. | 9 images |
| Euphorbia peplus L. | 6482 images |
| Euphorbia platyphyllos L. | 465 images |
| Euphorbia polygonifolia L. | 36 images |
| Euphorbia prostrata Aiton | 1845 images |
| Euphorbia saratoi Ardoino | 1 images |
| Euphorbia serpens Kunth | 487 images |
| Euphorbia virgata Waldst. & Kit. | 15 images |
| Euphrasia nemorosa (Pers.) Wallr. | 314 images |
| Euphrasia stricta J.P.Wolff ex J.F.Lehm. | 15 images |
| Euploca convolvulacea Nutt. | 2 images |
| Euploca procumbens (Mill.) Diane & Hilger | 26 images |
| Euploca tenella (Torr.) Feuillet & Halse | 38 images |
| Eurybia conspicua (Lindl.) G.L.Nesom | 8 images |
| Eurybia hemispherica (Alexander) G.L.Nesom | 3 images |
| Eurybia macrophylla (L.) Cass. | 1419 images |
| Eurybia schreberi (Nees) Nees | 23 images |
| Eustoma exaltatum (L.) Salisb. ex G.Don | 61 images |
| Eustoma russellianum (Hook.) G.Don | 1539 images |
| Euthamia graminifolia (L.) Nutt. | 660 images |
| Euthamia gymnospermoides Greene | 13 images |
| Euthamia occidentalis Nutt. | 42 images |
| Eutrochium fistulosum (Barratt) E.E.Lamont | 360 images |
| Eutrochium maculatum (L.) E.E.Lamont | 1226 images |
| Eutrochium purpureum (L.) E.E.Lamont | 236 images |
| Exochorda racemosa (Fortune ex Lindl.) Rehder | 11 images |
| Facelis retusa (Lam.) Sch.Bip. | 15 images |
| Fagopyrum esculentum Moench | 5647 images |
| Fagus grandifolia Ehrh. | 2303 images |
| Falcaria vulgaris Bernh. | 921 images |
| Fallopia convolvulus (L.) Á.Löve | 1312 images |
| Fallopia dumetorum (L.) Holub | 932 images |
| Fallopia scandens (L.) Holub | 22 images |
| Fallugia paradoxa (D.Don ex Tilloch & Taylor) Endl. ex Torr. | 19 images |
| Fatoua villosa (Thunb.) Nakai | 282 images |
| Festuca bromoides L. | 174 images |
| Festuca filiformis Pourr. | 138 images |
| Festuca idahoensis Elmer | 3 images |
| Festuca myuros L. | 246 images |
| Festuca occidentalis Hook. | 7 images |
| Festuca octoflora Walter | 10 images |
| Festuca ovina L. | 206 images |
| Festuca rubra L. | 315 images |
| Festuca trachyphylla (Hack.) Hack. | 14 images |
| Festuca valesiaca Schleich. ex Gaudin | 21 images |
| Filago arvensis L. | 160 images |
| Filipendula rubra (Hill) B.L.Rob. | 222 images |
| Filipendula ulmaria (L.) Maxim. | 11489 images |
| Fimbristylis autumnalis (L.) Roem. & Schult. | 287 images |
| Fimbristylis dichotoma (L.) Vahl | 59 images |
| Fimbristylis littoralis Gaudich. | 40 images |
| Fimbristylis vahlii (Lam.) Link | 20 images |
| Flaveria trinervia (Spreng.) C.Mohr | 74 images |
| Fleischmannia incarnata (Walter) R.M.King & H.Rob. | 15 images |
| Floerkea proserpinacoides Willd. | 45 images |
| Foeniculum vulgare Mill. | 10726 images |
| Forestiera acuminata (Michx.) Poir. | 17 images |
| Forestiera pubescens Nutt. | 98 images |
| Forsythia suspensa (Thunb.) Vahl | 4875 images |
| Forsythia viridissima Lindl. | 2956 images |
| Fragaria × ananassa (Duchesne ex Weston) Duchesne ex Rozier | 3974 images |
| Fragaria vesca L. | 11240 images |
| Fragaria virginiana Mill. | 326 images |
| Frangula alnus Mill. | 5672 images |
| Frangula caroliniana (Walter) A.Gray | 90 images |
| Frasera caroliniensis Walter | 52 images |
| Frasera speciosa Douglas ex Griseb. | 57 images |
| Fraxinus americana L. | 4693 images |
| Fraxinus nigra Marshall | 25 images |
| Fraxinus pennsylvanica Marshall | 808 images |
| Fraxinus profunda (Bush) Bush | 19 images |
| Fraxinus quadrangulata Michx. | 34 images |
| Fritillaria atropurpurea Nutt. | 77 images |
| Froelichia floridana (Nutt.) Moq. | 53 images |
| Froelichia gracilis (Hook.) Moq. | 33 images |
| Fuirena pumila (Torr.) Spreng. | 1 images |
| Fuirena simplex Vahl | 8 images |
| Fuirena squarrosa Michx. | 1 images |
| Fumaria officinalis L. | 7505 images |
| Fumaria vaillantii Loisel. | 246 images |
| Funastrum crispum (Benth.) Schltr. | 3 images |
| Funastrum cynanchoides (Decne.) Schltr. | 37 images |
| Gaillardia aestivalis (Walter) H.Rock | 19 images |
| Gaillardia aristata Pursh | 2520 images |
| Gaillardia pinnatifida Torr. | 61 images |
| Gaillardia pulchella Foug. | 3197 images |
| Gaillardia suavis (A.Gray & Engelm.) Britton & Rusby | 16 images |
| Galactia volubilis (L.) Britton | 4 images |
| Galearis rotundifolia (Banks ex Pursh) R.M.Bateman | 4 images |
| Galearis spectabilis (L.) Raf. | 159 images |
| Galeopsis angustifolia Ehrh. ex Hoffm. | 788 images |
| Galeopsis bifida Boenn. | 484 images |
| Galeopsis ladanum L. | 646 images |
| Galeopsis tetrahit L. | 8640 images |
| Galinsoga parviflora Cav. | 3205 images |
| Galinsoga quadriradiata Ruiz & Pav. | 3843 images |
| Galium aparine L. | 12704 images |
| Galium asprellum Michx. | 15 images |
| Galium boreale L. | 917 images |
| Galium circaezans Michx. | 78 images |
| Galium divaricatum Pourr. ex Lam. | 24 images |
| Galium labradoricum (Wiegand) Wiegand | 1 images |
| Galium mollugo L. | 9310 images |
| Galium obtusum Bigelow | 7 images |
| Galium odoratum (L.) Scop. | 7115 images |
| Galium palustre L. | 1534 images |
| Galium pilosum Aiton | 7 images |
| Galium spurium L. | 30 images |
| Galium sylvaticum L. | 1305 images |
| Galium tinctorium L. | 1 images |
| Galium tricornutum Dandy | 285 images |
| Galium trifidum L. | 36 images |
| Galium triflorum Michx. | 191 images |
| Galium verum L. | 9814 images |
| Galium virgatum Nutt. | 10 images |
| Gamochaeta antillana (Urb.) Anderb. | 34 images |
| Gamochaeta pensylvanica (Willd.) Cabrera | 66 images |
| Gamochaeta purpurea (L.) Cabrera | 79 images |
| Gaultheria hispidula (L.) Muhl. ex Bigelow | 62 images |
| Gaultheria procumbens L. | 1221 images |
| Gaylussacia baccata (Wangenh.) K.Koch | 28 images |
| Genista tinctoria L. | 2203 images |
| Gentiana affinis Griseb. | 35 images |
| Gentiana alba Muhl. ex J.McNab | 8 images |
| Gentiana andrewsii Griseb. | 141 images |
| Gentiana puberulenta J.S.Pringle | 2 images |
| Gentiana saponaria L. | 7 images |
| Gentiana septemfida Pall. | 87 images |
| Gentianella amarella (L.) Börner | 143 images |
| Gentianella quinquefolia (L.) Small | 19 images |
| Gentianopsis crinita (Froel.) Ma | 58 images |
| Gentianopsis virgata (Raf.) Holub | 14 images |
| Geocaulon lividum (Richardson) Fernald | 2 images |
| Geranium bicknellii Britton | 30 images |
| Geranium carolinianum L. | 1264 images |
| Geranium columbinum L. | 1196 images |
| Geranium dissectum L. | 5766 images |
| Geranium maculatum L. | 1368 images |
| Geranium molle L. | 8639 images |
| Geranium nepalense Sweet | 35 images |
| Geranium oreganum Howell | 13 images |
| Geranium pratense L. | 7686 images |
| Geranium pusillum L. | 8263 images |
| Geranium richardsonii Fisch. & Trautv. | 18 images |
| Geranium robertianum L. | 22236 images |
| Geranium rotundifolium L. | 4447 images |
| Geranium sanguineum L. | 8817 images |
| Geranium sibiricum L. | 508 images |
| Geranium sylvaticum L. | 8299 images |
| Geranium thunbergii Siebold & Zucc. | 16 images |
| Geranium viscosissimum Fisch. & C.A.Mey. | 85 images |
| Geum aleppicum Jacq. | 241 images |
| Geum canadense Jacq. | 101 images |
| Geum laciniatum Murray | 475 images |
| Geum macrophyllum Willd. | 2944 images |
| Geum rivale L. | 3504 images |
| Geum triflorum Pursh | 95 images |
| Geum urbanum L. | 14099 images |
| Geum vernum (Raf.) Torr. & A.Gray | 2 images |
| Geum virginianum L. | 12 images |
| Gilia achilleifolia Benth. | 63 images |
| Gilia capitata Sims | 473 images |
| Gillenia stipulata (Muhl. ex Willd.) Nutt. | 6 images |
| Gillenia trifoliata (L.) Moench | 101 images |
| Ginkgo biloba L. | 9356 images |
| Glaucium corniculatum (L.) Curtis | 101 images |
| Glaucium flavum Crantz | 5113 images |
| Glechoma hederacea L. | 25710 images |
| Gleditsia aquatica Marshall | 40 images |
| Gleditsia triacanthos L. | 10624 images |
| Glinus lotoides L. | 114 images |
| Glinus radiatus (Ruiz & Pav.) Rohrb. | 1 images |
| Glyceria canadensis (Michx.) Trin. | 11 images |
| Glyceria declinata Bréb. | 26 images |
| Glyceria fluitans (L.) R.Br. | 149 images |
| Glyceria maxima (Hartm.) Holmb. | 367 images |
| Glyceria septentrionalis Hitchc. | 2 images |
| Glyceria striata (Lam.) Hitchc. | 33 images |
| Glycine max (L.) Merr. | 2244 images |
| Glycyrrhiza lepidota Pursh | 72 images |
| Gnaphalium exilifolium A.Nelson | 7 images |
| Gnaphalium palustre Nutt. | 35 images |
| Gnaphalium uliginosum L. | 1063 images |
| Goodyera oblongifolia Raf. | 192 images |
| Goodyera pubescens (Willd.) R.Br. | 324 images |
| Goodyera repens (L.) R.Br. | 322 images |
| Goodyera tesselata G.Lodd. | 24 images |
| Gossypium hirsutum L. | 498 images |
| Gratiola lutea Raf. | 5 images |
| Gratiola neglecta Torr. | 18 images |
| Gratiola virginiana L. | 8 images |
| Grindelia ciliata (Nutt.) Spreng. | 9 images |
| Grindelia hirsutula Hook. & Arn. | 108 images |
| Grindelia lanceolata Nutt. | 41 images |
| Grindelia squarrosa (Pursh) Dunal | 295 images |
| Guilleminea densa (Willd. ex Schult.) Moq. | 38 images |
| Guilleminea lanuginosa (Poir.) Benth. & Hook.f. | 3 images |
| Guizotia abyssinica (L.f.) Cass. | 863 images |
| Gutierrezia sarothrae (Pursh) Britton & Rusby | 66 images |
| Gutierrezia texana (DC.) Torr. & A.Gray | 2 images |
| Gymnocarpium dryopteris (L.) Newman | 654 images |
| Gymnocarpium robertianum (Hoffm.) Newman | 260 images |
| Gymnocladus dioicus (L.) K.Koch | 461 images |
| Gypsophila acutifolia Steven ex Spreng. | 9 images |
| Gypsophila elegans M.Bieb. | 1124 images |
| Gypsophila paniculata L. | 1250 images |
| Gypsophila scorzonerifolia Ser. | 3 images |
| Gypsophila vaccaria (L.) Sm. | 1380 images |
| Habenaria repens Nutt. | 10 images |
| Hackelia deflexa (Wahlenb.) Opiz | 19 images |
| Hackelia floribunda (Lehm.) I.M.Johnst. | 19 images |
| Hackelia virginiana (L.) I.M.Johnst. | 131 images |
| Hackelochloa granularis (L.) Kuntze | 9 images |
| Halerpestes cymbalaria (Pursh) Greene | 11 images |
| Halesia carolina L. | 460 images |
| Hamamelis vernalis Sarg. | 16 images |
| Hamamelis virginiana L. | 2855 images |
| Hammarbya paludosa (L.) Kuntze | 31 images |
| Haploesthes greggii A.Gray | 2 images |
| Harperella nodosa (Rose) Rose | 5 images |
| Hasteola suaveolens (L.) Pojark. | 17 images |
| Hedeoma drummondii Benth. | 6 images |
| Hedeoma hispida Pursh | 2 images |
| Hedeoma pulegioides (L.) Pers. | 24 images |
| Hedera helix L. | 23675 images |
| Hedlundia thuringiaca (Nyman) Sennikov & Kurtto | 300 images |
| Hedysarum alpinum L. | 8 images |
| Hedysarum boreale Nutt. | 8 images |
| Helanthium tenellum (Mart. ex Schult.f.) J.G.Sm. | 3 images |
| Helenium amarum (Raf.) H.Rock | 385 images |
| Helenium autumnale L. | 1400 images |
| Helenium elegans DC. | 11 images |
| Helenium flexuosum Raf. | 65 images |
| Helenium microcephalum DC. | 18 images |
| Helianthus × laetiflorus Pers. | 1529 images |
| Helianthus angustifolius L. | 115 images |
| Helianthus annuus L. | 15266 images |
| Helianthus ciliaris DC. | 17 images |
| Helianthus decapetalus L. | 281 images |
| Helianthus divaricatus L. | 892 images |
| Helianthus giganteus L. | 1001 images |
| Helianthus grosseserratus M.Martens | 49 images |
| Helianthus hirsutus Raf. | 78 images |
| Helianthus maximiliani Schrad. | 477 images |
| Helianthus mollis Buc'hoz | 89 images |
| Helianthus nuttallii Torr. & A.Gray | 12 images |
| Helianthus occidentalis Riddell | 34 images |
| Helianthus pauciflorus Nutt. | 173 images |
| Helianthus petiolaris Nutt. | 568 images |
| Helianthus salicifolius A.Dietr. | 147 images |
| Helianthus silphioides Nutt. | 19 images |
| Helianthus strumosus L. | 74 images |
| Helianthus tuberosus L. | 7578 images |
| Heliopsis helianthoides (L.) Sweet | 2124 images |
| Heliotropium curassavicum L. | 652 images |
| Heliotropium europaeum L. | 4879 images |
| Heliotropium indicum L. | 555 images |
| Helleborus viridis L. | 5112 images |
| Helminthotheca echioides (L.) Holub | 7187 images |
| Hemerocallis fulva (L.) L. | 9888 images |
| Hemerocallis lilioasphodelus L. | 5253 images |
| Hemionitis artax Christenh. | 1 images |
| Hemionitis atropurpurea (L.) Christenh. | 45 images |
| Hemionitis eatonii (Baker) Christenh. | 2 images |
| Hemionitis feei (T.Moore) Christenh. | 2 images |
| Hemionitis glabella (Mett.) Christenh. | 11 images |
| Hemionitis lanosa (Michx.) Christenh. | 16 images |
| Hemionitis lindheimeri (Hook.) Christenh. | 3 images |
| Hemionitis sinuata (Lag.) Christenh. | 13 images |
| Hemionitis wrightiana (Hook.) Christenh. | 2 images |
| Hepatica acutiloba DC. | 8 images |
| Hepatica americana (DC.) Ker Gawl. | 4 images |
| Heracleum mantegazzianum Sommier & Levier | 2657 images |
| Heracleum maximum W.Bartram | 681 images |
| Hesperis matronalis L. | 7530 images |
| Heteranthera dubia (Jacq.) MacMill. | 24 images |
| Heteranthera limosa (Sw.) Willd. | 45 images |
| Heteranthera reniformis Ruiz & Pav. | 110 images |
| Heterotheca camporum (Greene) Shinners | 29 images |
| Heterotheca canescens (DC.) Shinners | 16 images |
| Heterotheca subaxillaris (Lam.) Britton & Rusby | 283 images |
| Heterotheca villosa (Pursh) Shinners | 154 images |
| Heuchera americana L. | 295 images |
| Heuchera richardsonii R.Br. | 48 images |
| Heuchera villosa Michx. | 164 images |
| Hexasepalum teres (Walter) J.H.Kirkbr. | 106 images |
| Hibiscus laevis All. | 91 images |
| Hibiscus moscheutos L. | 4705 images |
| Hibiscus syriacus L. | 24077 images |
| Hibiscus trionum L. | 1041 images |
| Hieracium albiflorum Hook. | 184 images |
| Hieracium lachenalii Suter | 472 images |
| Hieracium murorum L. | 3581 images |
| Hieracium sabaudum L. | 805 images |
| Hieracium scabrum Michx. | 13 images |
| Hieracium umbellatum L. | 1984 images |
| Hieracium venosum L. | 156 images |
| Hippuris vulgaris L. | 477 images |
| Hoffmannseggia glauca (Ortega) Eifert | 102 images |
| Holcus lanatus L. | 5422 images |
| Holosteum umbellatum L. | 144 images |
| Homalosorus pycnocarpos (Spreng.) Pic.Serm. | 3 images |
| Hopia obtusa (Kunth) Zuloaga & Morrone | 1 images |
| Hordeum brachyantherum Nevski | 20 images |
| Hordeum jubatum L. | 479 images |
| Hordeum marinum Huds. | 263 images |
| Hordeum murinum L. | 6640 images |
| Hordeum pusillum Nutt. | 54 images |
| Hordeum vulgare L. | 8498 images |
| Hosta lancifolia (Thunb.) Engl. | 115 images |
| Hottonia inflata Elliott | 4 images |
| Houstonia caerulea L. | 504 images |
| Houstonia longifolia Gaertn. | 43 images |
| Houstonia micrantha (Shinners) Terrell | 38 images |
| Houstonia purpurea L. | 114 images |
| Houstonia pusilla Schoepf | 252 images |
| Houstonia rosea (Raf.) Terrell | 10 images |
| Hudsonia tomentosa Nutt. | 13 images |
| Humulus lupulus L. | 9498 images |
| Humulus scandens (Lour.) Merr. | 56 images |
| Huperzia selago (L.) Bernh. ex Schrank & Mart. | 395 images |
| Hybanthus concolor (T.F.Forst.) Spreng. | 1 images |
| Hydrangea arborescens L. | 5034 images |
| Hydrangea cinerea Small | 14 images |
| Hydrastis canadensis L. | 147 images |
| Hydrilla verticillata (L.f.) Royle | 6 images |
| Hydrocotyle americana L. | 50 images |
| Hydrocotyle ranunculoides L.f. | 198 images |
| Hydrocotyle umbellata L. | 58 images |
| Hydrocotyle verticillata Thunb. | 589 images |
| Hydrolea ovata Nutt. | 54 images |
| Hydrophyllum appendiculatum Michx. | 152 images |
| Hydrophyllum canadense L. | 16 images |
| Hydrophyllum macrophyllum Nutt. | 23 images |
| Hydrophyllum virginianum L. | 768 images |
| Hylodesmum glutinosum (Muhl. ex Willd.) H.Ohashi & R.R.Mill | 74 images |
| Hylodesmum nudiflorum (L.) H.Ohashi & R.R.Mill | 5 images |
| Hylotelephium erythrostictum (Miq.) H.Ohba | 25 images |
| Hylotelephium telephioides (Michx.) H.Ohba | 139 images |
| Hylotelephium telephium (L.) H.Ohba | 7873 images |
| Hymenocallis liriosme (Raf.) Shinners | 177 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. | 1298 images |
| Hypericum ascyron L. | 32 images |
| Hypericum canadense L. | 3 images |
| Hypericum crux-andreae (L.) Crantz | 3 images |
| Hypericum denticulatum Walter | 1 images |
| Hypericum ellipticum Hook. | 8 images |
| Hypericum fraseri (Spach) Steud. | 32 images |
| Hypericum gentianoides (L.) Britton, Sterns & Poggenb. | 19 images |
| Hypericum hypericoides (L.) Crantz | 243 images |
| Hypericum kalmianum L. | 146 images |
| Hypericum maculatum Crantz | 3737 images |
| Hypericum majus (A.Gray) Britton | 6 images |
| Hypericum mutilum L. | 112 images |
| Hypericum perforatum L. | 16589 images |
| Hypericum prolificum L. | 189 images |
| Hypericum punctatum Lam. | 207 images |
| Hypericum sphaerocarpum Michx. | 8 images |
| Hypericum virginicum L. | 21 images |
| Hypochaeris glabra L. | 2443 images |
| Hypochaeris radicata L. | 9562 images |
| Hypoxis hirsuta (L.) Coville | 284 images |
| Hyssopus officinalis L. | 2201 images |
| Ibervillea lindheimeri (A.Gray) Greene | 3 images |
| Ilex ambigua (Michx.) Torr. | 4 images |
| Ilex decidua Walter | 319 images |
| Ilex mucronata (L.) M.Powell, Savol. & S.Andrews | 92 images |
| Ilex opaca Aiton | 1329 images |
| Ilex verticillata (L.) A.Gray | 14 images |
| Ilex vomitoria Aiton | 748 images |
| Impatiens balfourii Hook.f. | 4353 images |
| Impatiens balsamina L. | 2263 images |
| Impatiens capensis Meerb. | 2232 images |
| Impatiens pallida Nutt. | 951 images |
| Indigofera miniata Ortega | 78 images |
| Inula helenium L. | 2507 images |
| Iodanthus pinnatifidus (Michx.) Steud. | 51 images |
| Ionactis linariifolia (L.) Greene | 20 images |
| Ipomoea amnicola Morong | 13 images |
| Ipomoea coccinea L. | 29 images |
| Ipomoea cristulata Hallier f. | 50 images |
| Ipomoea hederacea Jacq. | 500 images |
| Ipomoea hederifolia L. | 691 images |
| Ipomoea lacunosa L. | 333 images |
| Ipomoea leptophylla Torr. | 33 images |
| Ipomoea purpurea (L.) Roth | 7513 images |
| Ipomoea quamoclit L. | 679 images |
| Ipomoea setosa Ker Gawl. | 4 images |
| Ipomoea shumardiana (Torr.) Shinners | 3 images |
| Ipomopsis aggregata (Pursh) V.E.Grant | 1 images |
| Ipomopsis congesta (Hook.) V.E.Grant | 40 images |
| Ipomopsis longiflora (Torr.) V.E.Grant | 5 images |
| Ipomopsis rubra (L.) Wherry | 136 images |
| Iresine rhizomatosa Standl. | 2 images |
| Iris × germanica L. | 7444 images |
| Iris brevicaulis Raf. | 16 images |
| Iris cristata Aiton | 180 images |
| Iris domestica (L.) Goldblatt & Mabb. | 947 images |
| Iris fulva Ker Gawl. | 23 images |
| Iris lacustris Nutt. | 6 images |
| Iris missouriensis Nutt. | 101 images |
| Iris orientalis Mill. | 1141 images |
| Iris pallida Lam. | 2327 images |
| Iris pseudacorus L. | 9422 images |
| Iris pumila L. | 1506 images |
| Iris sibirica L. | 2214 images |
| Iris variegata L. | 525 images |
| Iris verna L. | 42 images |
| Iris versicolor L. | 825 images |
| Iris virginica L. | 117 images |
| Isatis tinctoria L. | 3681 images |
| Isoetes lacustris L. | 26 images |
| Isolepis cernua (Vahl) Roem. & Schult. | 106 images |
| Isolepis pseudosetacea (Daveau) Gand. | 6 images |
| Isotria medeoloides (Pursh) Raf. | 19 images |
| Itea virginica L. | 89 images |
| Iva annua L. | 115 images |
| Iva asperifolia Less. | 6 images |
| Iva axillaris Pursh | 6 images |
| Jacobaea vulgaris Gaertn. | 18519 images |
| Jacquemontia tamnifolia (L.) Griseb. | 165 images |
| Jeffersonia diphylla (L.) Pers. | 114 images |
| Juglans cinerea L. | 435 images |
| Juglans major (Torr.) A.Heller | 55 images |
| Juglans microcarpa Berland. | 11 images |
| Juglans nigra L. | 7368 images |
| Juncus alpinoarticulatus Chaix | 133 images |
| Juncus articulatus L. | 675 images |
| Juncus balticus Willd. | 28 images |
| Juncus brachycarpus Engelm. | 1 images |
| Juncus brachycephalus (Engelm.) Buchenau | 3 images |
| Juncus bufonius L. | 385 images |
| Juncus compressus Jacq. | 159 images |
| Juncus diffusissimus Buckley | 2 images |
| Juncus dudleyi Wiegand | 7 images |
| Juncus effusus L. | 3378 images |
| Juncus ensifolius Wikstr. | 87 images |
| Juncus filiformis L. | 100 images |
| Juncus gerardi Loisel. | 100 images |
| Juncus interior Wiegand | 3 images |
| Juncus marginatus Rostk. | 4 images |
| Juncus nodosus L. | 2 images |
| Juncus scirpoides Lam. | 3 images |
| Juncus squarrosus L. | 173 images |
| Juncus stygius L. | 10 images |
| Juncus tenuis Willd. | 525 images |
| Juncus torreyi Coville | 23 images |
| Juncus validus Coville | 1 images |
| Juniperus ashei J.Buchholz | 6 images |
| Juniperus communis L. | 8338 images |
| Juniperus horizontalis Moench | 1797 images |
| Juniperus monosperma (Engelm.) Sarg. | 48 images |
| Juniperus pinchotii Sudw. | 27 images |
| Juniperus scopulorum Sarg. | 512 images |
| Juniperus virginiana L. | 4430 images |
| Justicia lanceolata (Chapm.) Small | 4 images |
| Kallstroemia parviflora Norton | 2 images |
| Kalmia polifolia Wangenh. | 113 images |
| Kerria japonica (L.) DC. | 7563 images |
| Kickxia elatine (L.) Dumort. | 308 images |
| Kickxia spuria (L.) Dumort. | 727 images |
| Knautia arvensis (L.) Coult. | 14950 images |
| Koeleria macrantha (Ledeb.) Schult. | 136 images |
| Koeleria spicata (L.) Barberá, Quintanar, Soreng & P.M.Peterson | 87 images |
| Koelreuteria paniculata Laxm. | 8562 images |
| Krameria lanceolata Torr. | 44 images |
| Krigia biflora (Walter) S.F.Blake | 56 images |
| Krigia dandelion Nutt. | 55 images |
| Krigia occidentalis Nutt. | 3 images |
| Krigia virginica (L.) Willd. | 71 images |
| Kummerowia stipulacea (Maxim.) Makino | 3 images |
| Kummerowia striata (Thunb.) Schindl. | 151 images |
| Lactuca biennis (Moench) Fernald | 128 images |
| Lactuca canadensis L. | 384 images |
| Lactuca floridana (L.) Gaertn. | 561 images |
| Lactuca hirsuta Muhl. ex Nutt. | 23 images |
| Lactuca muralis (L.) E.Mey. | 444 images |
| Lactuca saligna L. | 350 images |
| Lactuca sativa L. | 4744 images |
| Lactuca serriola L. | 12226 images |
| Lagenaria siceraria (Molina) Standl. | 781 images |
| Lagerstroemia indica L. | 15480 images |
| Lamium album L. | 7906 images |
| Lamium amplexicaule L. | 5126 images |
| Lamium galeobdolon (L.) L. | 13171 images |
| Lamium hybridum Vill. | 7944 images |
| Lamium maculatum (L.) L. | 10760 images |
| Lamium purpureum L. | 16135 images |
| Laportea canadensis (L.) Wedd. | 256 images |
| Lappula occidentalis (S.Watson) Greene | 4 images |
| Lappula squarrosa (Retz.) Dumort. | 210 images |
| Lapsana communis L. | 13349 images |
| Larix decidua Mill. | 6114 images |
| Larix laricina (Du Roi) K.Koch | 213 images |
| Lathyrus hirsutus L. | 547 images |
| Lathyrus japonicus Willd. | 580 images |
| Lathyrus latifolius L. | 9598 images |
| Lathyrus ochroleucus Hook. | 28 images |
| Lathyrus odoratus L. | 3437 images |
| Lathyrus oleraceus Lam. | 4974 images |
| Lathyrus palustris L. | 200 images |
| Lathyrus pratensis L. | 4315 images |
| Lathyrus sylvestris L. | 2430 images |
| Lathyrus tuberosus L. | 1995 images |
| Lathyrus venosus Muhl. ex Willd. | 7 images |
| Leavenworthia uniflora (Michx.) Britton | 3 images |
| Lechea minor L. | 2 images |
| Lechea mucronata Raf. | 8 images |
| Lechea racemulosa Michx. | 2 images |
| Leersia lenticularis Michx. | 1 images |
| Leersia oryzoides (L.) Sw. | 244 images |
| Leersia virginica Willd. | 43 images |
| Leitneria floridana Chapm. | 7 images |
| Lemna aequinoctialis Welw. | 59 images |
| Lemna gibba L. | 70 images |
| Lemna minor L. | 896 images |
| Lemna minuta Kunth | 113 images |
| Lemna trisulca L. | 102 images |
| Lemna turionifera Landolt | 20 images |
| Lemna valdiviana Phil. | 7 images |
| Leontodon hispidus L. | 3228 images |
| Leontodon saxatilis Lam. | 1100 images |
| Leonurus cardiaca L. | 3293 images |
| Leonurus japonicus Houtt. | 27 images |
| Leonurus sibiricus L. | 264 images |
| Lepidium austrinum Small | 10 images |
| Lepidium campestre (L.) W.T.Aiton | 8 images |
| Lepidium coronopus (L.) Al-Shehbaz | 140 images |
| Lepidium densiflorum Schrad. | 48 images |
| Lepidium didymum L. | 1429 images |
| Lepidium draba L. | 7915 images |
| Lepidium latifolium L. | 767 images |
| Lepidium oblongum Small | 8 images |
| Lepidium perfoliatum L. | 40 images |
| Lepidium ruderale L. | 231 images |
| Lepidium sativum L. | 821 images |
| Lepidium virginicum L. | 1657 images |
| Leptochloa panicea (Retz.) Ohwi | 5 images |
| Lespedeza bicolor Turcz. | 457 images |
| Lespedeza capitata Michx. | 114 images |
| Lespedeza cuneata (Dum.Cours.) G.Don | 91 images |
| Lespedeza hirta (L.) Hornem. | 75 images |
| Lespedeza procumbens Michx. | 10 images |
| Lespedeza stuevei Nutt. | 6 images |
| Lespedeza thunbergii (DC.) Nakai | 250 images |
| Lespedeza violacea Pers. | 28 images |
| Lespedeza virginica (L.) Britton | 92 images |
| Leucanthemella serotina (L.) Tzvelev | 121 images |
| Leucanthemum vulgare Lam. | 10457 images |
| Leucocrinum montanum Nutt. ex A.Gray | 74 images |
| Leucojum aestivum L. | 2179 images |
| Leucospora multifida (Michx.) Nutt. | 31 images |
| Leuzea repens (L.) D.J.N.Hind | 23 images |
| Levisticum officinale W.D.J.Koch | 1534 images |
| Leymus arenarius (L.) Hochst. | 1032 images |
| Leymus cinereus (Scribn. & Merr.) Á.Löve | 3 images |
| Leymus innovatus (Beal) Pilg. | 1 images |
| Leymus mollis (Trin.) Pilg. | 6 images |
| Leymus racemosus (Lam.) Tzvelev | 13 images |
| Liatris aspera Michx. | 212 images |
| Liatris cylindracea Michx. | 36 images |
| Liatris elegans (Walter) Michx. | 21 images |
| Liatris ligulistylis (A.Nelson) K.Schum. | 1 images |
| Liatris punctata Hook. | 181 images |
| Liatris pycnostachya Michx. | 600 images |
| Liatris scariosa (L.) Willd. | 28 images |
| Liatris spicata (L.) Willd. | 2042 images |
| Liatris squarrosa (L.) Michx. | 69 images |
| Liatris squarrulosa Michx. | 7 images |
| Ligusticum canadense (L.) Britton | 16 images |
| Ligustrum obtusifolium Siebold & Zucc. | 120 images |
| Ligustrum quihoui Carrière | 13 images |
| Ligustrum vulgare L. | 18363 images |
| Lilium lancifolium Thunb. | 1709 images |
| Lilium michiganense Farw. | 75 images |
| Lilium philadelphicum L. | 116 images |
| Lilium superbum L. | 93 images |
| Limnosciadium pinnatum (DC.) Mathias & Constance | 14 images |
| Limosella aquatica L. | 56 images |
| Linaria dalmatica (L.) Mill. | 190 images |
| Linaria genistifolia (L.) Mill. | 213 images |
| Linaria vulgaris Mill. | 16822 images |
| Lindera benzoin (L.) Blume | 840 images |
| Lindernia dubia (L.) Pennell | 215 images |
| Lindheimera texana A.Gray & Engelm. | 42 images |
| Linnaea borealis L. | 613 images |
| Linum grandiflorum Desf. | 2658 images |
| Linum imbricatum (Raf.) B.D.Jacks. | 1 images |
| Linum lewisii Pursh | 172 images |
| Linum medium (Planch.) Britton | 20 images |
| Linum perenne L. | 2767 images |
| Linum pratense (Norton) Small | 34 images |
| Linum puberulum (Engelm.) A.Heller | 17 images |
| Linum rigidum Pursh | 17 images |
| Linum sulcatum Riddell | 4 images |
| Linum usitatissimum L. | 5233 images |
| Linum virginianum L. | 1 images |
| Lipandra polysperma (L.) S.Fuentes, Uotila & Borsch | 1067 images |
| Liparis liliifolia (L.) Rich. ex Lindl. | 11 images |
| Liparis loeselii (L.) Rich. | 188 images |
| Liquidambar styraciflua L. | 11496 images |
| Liriodendron tulipifera L. | 9558 images |
| Liriope spicata Lour. | 47 images |
| Lithophragma glabrum Nutt. | 51 images |
| Lithophragma parviflorum (Hook.) Nutt. | 3 images |
| Lithospermum canescens (Michx.) Lehm. | 124 images |
| Lithospermum incisum Lehm. | 130 images |
| Lithospermum latifolium Michx. | 7 images |
| Lithospermum molle (Michx.) Muhl. | 7 images |
| Lithospermum multiflorum Torr. ex A.Gray | 10 images |
| Lithospermum officinale L. | 1512 images |
| Lithospermum parviflorum Weakley, Witsell & D.Estes | 2 images |
| Lobelia × speciosa Sweet | 25 images |
| Lobelia cardinalis L. | 1821 images |
| Lobelia dortmanna L. | 150 images |
| Lobelia inflata L. | 472 images |
| Lobelia kalmii L. | 53 images |
| Lobelia nuttallii Schult. | 1 images |
| Lobelia puberula Michx. | 94 images |
| Lobelia siphilitica L. | 1127 images |
| Lobelia spicata Lam. | 120 images |
| Lobularia maritima (L.) Desv. | 12668 images |
| Loeflingia squarrosa Nutt. | 2 images |
| Lolium arundinaceum (Schreb.) Darbysh. | 726 images |
| Lolium multiflorum Lam. | 319 images |
| Lolium perenne L. | 2953 images |
| Lolium pratense (Huds.) Darbysh. | 673 images |
| Lolium rigidum Gaudin | 173 images |
| Lolium temulentum L. | 29 images |
| Lomatium cous (S.Watson) J.M.Coult. & Rose | 16 images |
| Lomatium foeniculaceum (Nutt.) J.M.Coult. & Rose | 6 images |
| Lonicera canadensis J.Bartram & W.Bartram ex Marshall | 118 images |
| Lonicera dioica L. | 101 images |
| Lonicera flava Sims | 41 images |
| Lonicera fragrantissima Lindl. & Paxton | 1951 images |
| Lonicera hirsuta Eaton | 20 images |
| Lonicera involucrata (Richardson) Banks ex Spreng. | 766 images |
| Lonicera japonica Thunb. | 9736 images |
| Lonicera maackii (Rupr.) Maxim. | 2050 images |
| Lonicera oblongifolia Hook. | 4 images |
| Lonicera reticulata Raf. | 11 images |
| Lonicera ruprechtiana Regel | 3 images |
| Lonicera sempervirens L. | 1396 images |
| Lonicera tatarica L. | 4899 images |
| Lonicera villosa (Michx.) Schult. | 3 images |
| Lonicera xylosteum L. | 9803 images |
| Lotus corniculatus L. | 18665 images |
| Ludwigia alternifolia L. | 206 images |
| Ludwigia decurrens Walter | 40 images |
| Ludwigia glandulosa Walter | 4 images |
| Ludwigia grandiflora (Michx.) Greuter & Burdet | 1157 images |
| Ludwigia leptocarpa (Nutt.) H.Hara | 7 images |
| Ludwigia linearis Walter | 9 images |
| Ludwigia palustris (L.) Elliott | 279 images |
| Ludwigia peploides (Kunth) P.H.Raven | 652 images |
| Ludwigia repens J.R.Forst. | 8 images |
| Ludwigia sphaerocarpa Elliott | 1 images |
| Luffa aegyptiaca Mill. | 61 images |
| Lunaria annua L. | 20145 images |
| Lupinus argenteus Pursh | 101 images |
| Lupinus perennis L. | 566 images |
| Lupinus polyphyllus Lindl. | 8092 images |
| Lupinus pusillus Pursh | 14 images |
| Lupinus sericeus Pursh | 42 images |
| Luzula acuminata Raf. | 14 images |
| Luzula luzuloides (Lam.) Dandy & Wilmott | 506 images |
| Luzula multiflora (Ehrh.) Lej. | 370 images |
| Luzula parviflora (Ehrh.) Desv. | 4 images |
| Lycium barbarum L. | 2722 images |
| Lycium chinense Mill. | 170 images |
| Lycopodiella appressa (Chapm.) Cranfill | 3 images |
| Lycopodiella inundata (L.) Holub | 146 images |
| Lycopodium × zeilleri (Rouy) Greuter & Burdet | 59 images |
| Lycopodium annotinum L. | 916 images |
| Lycopodium clavatum L. | 692 images |
| Lycopodium complanatum L. | 214 images |
| Lycopodium dendroideum Michx. | 168 images |
| Lycopodium digitatum Dill. ex A.Braun | 30 images |
| Lycopodium obscurum L. | 2 images |
| Lycopodium tristachyum Pursh | 90 images |
| Lycopus americanus Muhl. ex W.P.C.Barton | 4 images |
| Lycopus asper Greene | 11 images |
| Lycopus europaeus L. | 5487 images |
| Lycopus rubellus Moench | 8 images |
| Lycopus uniflorus Michx. | 101 images |
| Lycopus virginicus L. | 38 images |
| Lycoris radiata (L'Hér.) Herb. | 314 images |
| Lygodesmia texana (Torr. & A.Gray) Greene ex Small | 1 images |
| Lygodium japonicum (Thunb.) Sw. | 102 images |
| Lyonia ligustrina (L.) DC. | 11 images |
| Lyonia mariana (L.) D.Don | 7 images |
| Lysimachia arvensis (L.) U.Manns & Anderb. | 9965 images |
| Lysimachia borealis (Raf.) U.Manns & Anderb. | 527 images |
| Lysimachia ciliata L. | 762 images |
| Lysimachia clethroides Duby | 945 images |
| Lysimachia foemina (Mill.) U.Manns & Anderb. | 2245 images |
| Lysimachia hybrida Michx. | 1 images |
| Lysimachia lanceolata Walter | 24 images |
| Lysimachia maritima (L.) Galasso, Banfi & Soldano | 362 images |
| Lysimachia minima (L.) U.Manns & Anderb. | 18 images |
| Lysimachia nummularia L. | 4015 images |
| Lysimachia punctata L. | 8289 images |
| Lysimachia quadriflora Sims | 10 images |
| Lysimachia quadrifolia L. | 179 images |
| Lysimachia terrestris (L.) Britton, Sterns & Poggenb. | 12 images |
| Lysimachia thyrsiflora L. | 321 images |
| Lysimachia vulgaris L. | 8127 images |
| Lythrum alatum Pursh | 48 images |
| Lythrum hyssopifolia L. | 461 images |
| Lythrum salicaria L. | 23473 images |
| Lythrum virgatum L. | 1148 images |
| Machaeranthera tanacetifolia (Kunth) Nees | 118 images |
| Macleaya cordata (Willd.) R.Br. | 856 images |
| Maclura pomifera (Raf.) C.K.Schneid. | 3775 images |
| Madia glomerata Hook. | 5 images |
| Magnolia acuminata (L.) L. | 809 images |
| Magnolia macrophylla Michx. | 461 images |
| Magnolia stellata (Siebold & Zucc.) Maxim. | 4167 images |
| Magnolia tripetala (L.) L. | 368 images |
| Maianthemum canadense Desf. | 985 images |
| Maianthemum racemosum (L.) Link | 1439 images |
| Maianthemum stellatum (L.) Link | 536 images |
| Maianthemum trifolium (L.) Sloboda | 17 images |
| Malaxis monophyllos (L.) Sw. | 46 images |
| Malaxis unifolia Michx. | 17 images |
| Malus angustifolia (Aiton) Michx. | 30 images |
| Malus baccata (L.) Borkh. | 2268 images |
| Malus coronaria (L.) Mill. | 84 images |
| Malus domestica (Suckow) Borkh. | 6975 images |
| Malus hupehensis (Pamp.) Rehder | 1565 images |
| Malus ioensis (Alph.Wood) Britton | 14 images |
| Malus prunifolia (Willd.) Borkh. | 207 images |
| Malus toringo (Siebold) de Vriese | 112 images |
| Malva alcea L. | 12024 images |
| Malva moschata L. | 4942 images |
| Malva neglecta Wallr. | 5203 images |
| Malva parviflora L. | 2672 images |
| Malva pusilla Sm. | 1318 images |
| Malva sylvestris L. | 25625 images |
| Malva thuringiaca (L.) Vis. | 504 images |
| Malva trimestris (L.) Salisb. | 2905 images |
| Malva verticillata L. | 205 images |
| Malvastrum hispidum (Pursh) Hochr. | 6 images |
| Malvella leprosa (Ortega) Krapov. | 119 images |
| Mammillaria heyderi Muehlenpf. | 34 images |
| Marrubium vulgare L. | 4259 images |
| Marshallia caespitosa Nutt. ex DC. | 20 images |
| Marsilea quadrifolia L. | 281 images |
| Matelea biflora (Raf.) Woodson | 45 images |
| Matelea decipiens (Alexander) Woodson | 8 images |
| Matelea obliqua (Jacq.) Woodson | 5 images |
| Matricaria chamomilla L. | 9626 images |
| Matricaria discoidea DC. | 3405 images |
| Matthiola incana (L.) W.T.Aiton | 154 images |
| Mazus miquelii Makino | 23 images |
| Mazus pumilus (Burm.f.) Steenis | 258 images |
| Mecardonia acuminata (Walter) Small | 6 images |
| Medeola virginiana L. | 310 images |
| Medicago × varia Martyn | 199 images |
| Medicago arabica (L.) Huds. | 3313 images |
| Medicago falcata L. | 1176 images |
| Medicago lupulina L. | 6564 images |
| Medicago minima (L.) Bartal. | 28 images |
| Medicago orbicularis (L.) Bartal. | 726 images |
| Medicago sativa L. | 15842 images |
| Megathyrsus maximus (Jacq.) B.K.Simon & S.W.L.Jacobs | 173 images |
| Melampodium leucanthum Torr. & A.Gray | 70 images |
| Melampyrum lineare Lam. | 147 images |
| Melanthera nivea (L.) Small | 105 images |
| Melanthium virginicum L. | 9 images |
| Melia azedarach L. | 10343 images |
| Melica altissima L. | 40 images |
| Melica mutica Walter | 20 images |
| Melica nitens (Scribn.) Nutt. ex Piper | 3 images |
| Melica porteri Scribn. | 1 images |
| Melica subulata (Griseb.) Scribn. | 2 images |
| Melilotus albus Medik. | 6714 images |
| Melilotus altissimus Thuill. | 453 images |
| Melilotus indicus (L.) All. | 2241 images |
| Melilotus officinalis (L.) Lam. | 3703 images |
| Melissa officinalis L. | 13167 images |
| Melochia corchorifolia L. | 83 images |
| Melothria pendula L. | 493 images |
| Menispermum canadense L. | 225 images |
| Mentha × dumetorum Schult. | 1 images |
| Mentha × gracilis Sole | 12 images |
| Mentha × piperita L. | 3116 images |
| Mentha × rotundifolia (L.) Huds. | 918 images |
| Mentha × verticillata L. | 44 images |
| Mentha × villosa Huds. | 320 images |
| Mentha aquatica L. | 7135 images |
| Mentha arvensis L. | 2938 images |
| Mentha canadensis L. | 11 images |
| Mentha longifolia (L.) L. | 1989 images |
| Mentha spicata L. | 8525 images |
| Mentha suaveolens Ehrh. | 10759 images |
| Mentzelia decapetala (Sims) Urb. | 9 images |
| Mentzelia dispersa S.Watson | 2 images |
| Mentzelia multiflora (Nutt.) A.Gray | 61 images |
| Mentzelia oligosperma Nutt. ex Sims | 1 images |
| Menyanthes trifoliata L. | 1752 images |
| Mertensia lanceolata (Pursh) DC. | 14 images |
| Mertensia oblongifolia (Nutt.) G.Don | 26 images |
| Mertensia paniculata (Aiton) G.Don | 56 images |
| Mertensia virginica (L.) Pers. ex Link | 882 images |
| Micranthes pensylvanica (L.) Haw. | 32 images |
| Micranthes texana (Buckley) Small | 10 images |
| Micranthes virginiensis (Michx.) Small | 100 images |
| Microseris cuspidata (Pursh) Sch.Bip. | 14 images |
| Microseris nutans (Hook.) Sch.Bip. | 7 images |
| Microstegium vimineum (Trin.) A.Camus | 87 images |
| Microsteris gracilis (Hook.) Greene | 20 images |
| Mikania scandens (L.) Willd. | 278 images |
| Milium effusum L. | 323 images |
| Mimosa quadrivalvis L. | 272 images |
| Mimosa strigillosa Torr. & A.Gray | 3 images |
| Mimulus alatus Aiton | 108 images |
| Mimulus ringens L. | 435 images |
| Mirabilis albida (Walter) Heimerl | 45 images |
| Mirabilis gigantea (Standl.) Shinners | 3 images |
| Mirabilis jalapa L. | 14821 images |
| Mirabilis linearis (Pursh) Heimerl | 13 images |
| Mirabilis nyctaginea (Michx.) MacMill. | 195 images |
| Miscanthus floridulus (Labill.) Warb. ex K.Schum. & Lauterb. | 9 images |
| Miscanthus sacchariflorus (Maxim.) Benth. & Hook.f. ex Franch. | 42 images |
| Miscanthus sinensis Andersson | 3308 images |
| Misopates orontium (L.) Raf. | 1713 images |
| Mitchella repens L. | 891 images |
| Mitella diphylla L. | 125 images |
| Mitella nuda L. | 14 images |
| Mitreola petiolata (J.F.Gmel.) Torr. & A.Gray | 2 images |
| Modiola caroliniana (L.) G.Don | 187 images |
| Moehringia lateriflora (L.) Fenzl | 42 images |
| Moehringia macrophylla (Hook.) Fenzl | 25 images |
| Moenchia erecta (L.) G.Gaertn., B.Mey. & Scherb. | 59 images |
| Molinia caerulea (L.) Moench | 1028 images |
| Mollugo verticillata L. | 317 images |
| Moluccella laevis L. | 267 images |
| Momordica balsamina L. | 244 images |
| Monarda bradburiana Beck | 11 images |
| Monarda citriodora Cerv. ex Lag. | 360 images |
| Monarda clinopodia L. | 76 images |
| Monarda didyma L. | 3008 images |
| Monarda fistulosa L. | 2131 images |
| Monarda media Willd. | 16 images |
| Monarda pectinata Nutt. | 8 images |
| Monarda punctata L. | 345 images |
| Monarda russeliana Nutt. ex Sims | 17 images |
| Moneses uniflora (L.) A.Gray | 306 images |
| Mononeuria nuttallii (Torr. & A.Gray) Dillenb. & Kadereit | 3 images |
| Mononeuria patula (Michx.) Dillenb. & Kadereit | 27 images |
| Monotropa hypopitys L. | 1051 images |
| Monotropa uniflora L. | 1084 images |
| Montia chamissoi (Ledeb. ex Spreng.) Greene | 4 images |
| Moorochloa eruciformis (Sm.) Veldkamp | 9 images |
| Morus alba L. | 11388 images |
| Morus rubra L. | 2578 images |
| Muhlenbergia capillaris (Lam.) Trin. | 215 images |
| Muhlenbergia frondosa (Poir.) Fernald | 8 images |
| Muhlenbergia glabrifloris Scribn. | 1 images |
| Muhlenbergia glomerata (Willd.) Trin. | 1 images |
| Muhlenbergia mexicana (L.) Trin. | 5 images |
| Muhlenbergia porteri Scribn. | 10 images |
| Muhlenbergia pungens Thurb. | 1 images |
| Muhlenbergia reverchonii Vasey & Scribn. | 2 images |
| Muhlenbergia schreberi J.F.Gmel. | 5 images |
| Muhlenbergia torreyi (Kunth) Hitchc. ex Bush | 1 images |
| Mummenhoffia alliacea (L.) Esmailbegi & Al-Shehbaz | 254 images |
| Muscari armeniacum H.J.Veitch | 26 images |
| Muscari botryoides (L.) Mill. | 5393 images |
| Muscari comosum (L.) Mill. | 10784 images |
| Muscari neglectum Guss. ex Ten. | 10634 images |
| Muscarimia muscari (L.) Losinsk. | 3 images |
| Myosotis arvensis (L.) Hill | 2805 images |
| Myosotis discolor Pers. | 807 images |
| Myosotis laxa Lehm. | 292 images |
| Myosotis macrosperma Engelm. | 87 images |
| Myosotis scorpioides L. | 5636 images |
| Myosotis stricta Link ex Roem. & Schult. | 635 images |
| Myosotis sylvatica Ehrh. ex Hoffm. | 418 images |
| Myosotis verna Nutt. | 12 images |
| Myrica cerifera L. | 582 images |
| Myrica gale L. | 648 images |
| Myriophyllum alterniflorum DC. | 45 images |
| Myriophyllum aquaticum (Vell.) Verdc. | 567 images |
| Myriophyllum heterophyllum Michx. | 9 images |
| Myriophyllum sibiricum Kom. | 7 images |
| Myriophyllum spicatum L. | 289 images |
| Myriophyllum verticillatum L. | 67 images |
| Nabalus albus (L.) Hook. | 150 images |
| Nabalus altissimus (L.) Hook. | 3 images |
| Najas gracillima (A.Braun ex Engelm.) Magnus | 1 images |
| Najas guadalupensis (Spreng.) Magnus | 14 images |
| Najas marina L. | 114 images |
| Najas minor All. | 22 images |
| Napaea dioica L. | 26 images |
| Narcissus × incomparabilis Mill. | 79 images |
| Narcissus × medioluteus Mill. | 567 images |
| Narcissus jonquilla L. | 2009 images |
| Narcissus poeticus L. | 2877 images |
| Narcissus pseudonarcissus L. | 9421 images |
| Nassella trichotoma (Nees) Hack. & Arechav. | 13 images |
| Nasturtium microphyllum (Boenn.) Rchb. | 61 images |
| Nasturtium officinale W.T.Aiton | 648 images |
| Navarretia intertexta (Benth.) Hook. | 26 images |
| Nelumbo lutea (Willd.) Pers. | 5 images |
| Nelumbo nucifera Gaertn. | 1908 images |
| Nemastylis geminiflora Nutt. | 39 images |
| Nemophila aphylla (L.) Brummitt | 29 images |
| Nemophila phacelioides W.P.C.Barton | 102 images |
| Neottia auriculata (Wiegand) Szlach. | 1 images |
| Neottia bifolia (Raf.) Baumbach | 1 images |
| Neottia convallarioides (Sw.) Rich. | 4 images |
| Neottia cordata (L.) Rich. | 212 images |
| Nepeta cataria L. | 3650 images |
| Neptunia lutea (Leavenw.) Benth. | 13 images |
| Neslia paniculata (L.) Desv. | 78 images |
| Nicandra physalodes (L.) Gaertn. | 2855 images |
| Nicotiana longiflora Cav. | 76 images |
| Nicotiana obtusifolia M.Martens & Galeotti | 1 images |
| Nicotiana rustica L. | 345 images |
| Nigella damascena L. | 12722 images |
| Noccaea perfoliata (L.) Al-Shehbaz | 1197 images |
| Nothoscordum bivalve (L.) Britton | 617 images |
| Nuttallanthus canadensis (L.) D.A.Sutton | 15 images |
| Nymphaea mexicana Zucc. | 173 images |
| Nymphaea odorata Aiton | 404 images |
| Nymphoides peltata (S.G.Gmel.) Kuntze | 441 images |
| Nyssa aquatica L. | 48 images |
| Nyssa biflora Walter | 5 images |
| Nyssa sylvatica Marshall | 968 images |
| Obolaria virginica L. | 66 images |
| Ocimum basilicum L. | 9213 images |
| Odontites vulgaris Moench | 9 images |
| Oenanthe javanica (Blume) DC. | 55 images |
| Oenothera albicaulis Pursh | 53 images |
| Oenothera biennis L. | 14289 images |
| Oenothera cespitosa Nutt. | 45 images |
| Oenothera elata Kunth | 184 images |
| Oenothera filiformis (Small) W.L.Wagner & Hoch | 4 images |
| Oenothera filipes (Spach) W.L.Wagner & Hoch | 8 images |
| Oenothera flava (A.Nelson) Garrett | 39 images |
| Oenothera fruticosa L. | 1503 images |
| Oenothera gaura W.L.Wagner & Hoch | 1983 images |
| Oenothera glazioviana Micheli | 7361 images |
| Oenothera grandis Smyth | 2 images |
| Oenothera hartwegii Benth. | 63 images |
| Oenothera howardii (A.Nelson) M.E.Jones ex Prain | 18 images |
| Oenothera laciniata Hill | 553 images |
| Oenothera lavandulifolia Torr. & A.Gray | 3 images |
| Oenothera linifolia Nutt. | 14 images |
| Oenothera macrocarpa Nutt. | 619 images |
| Oenothera nuttallii Torr. & A.Gray | 2 images |
| Oenothera oakesiana (A.Gray) J.W.Robbins ex S.Watson | 6 images |
| Oenothera pallida Lindl. | 38 images |
| Oenothera parviflora L. | 1250 images |
| Oenothera perennis L. | 8 images |
| Oenothera pilosella Raf. | 31 images |
| Oenothera rhombipetala Nutt. | 6 images |
| Oenothera speciosa Nutt. | 2964 images |
| Oenothera suffrutescens (Moc. & Sessé ex Ser.) W.L.Wagner & Hoch | 84 images |
| Oenothera suffulta (Engelm.) W.L.Wagner & Hoch | 10 images |
| Oenothera tetragona Roth | 10 images |
| Oenothera triloba Nutt. | 83 images |
| Oenothera villosa Thunb. | 70 images |
| Omalotheca sylvatica (L.) Sch.Bip. & F.W.Schultz | 532 images |
| Onobrychis viciifolia Scop. | 7213 images |
| Onoclea sensibilis L. | 1565 images |
| Ononis spinosa L. | 4405 images |
| Onopordum acanthium L. | 4865 images |
| Ophioglossum crotalophoroides Walter | 4 images |
| Ophioglossum engelmannii Prantl | 12 images |
| Ophioglossum petiolatum Hook. | 10 images |
| Ophioglossum pusillum Raf. | 4 images |
| Ophioglossum vulgatum L. | 341 images |
| Oplismenus compositus (L.) P.Beauv. | 35 images |
| Opuntia camanchica Engelm. & J.M.Bigelow | 2 images |
| Opuntia cespitosa Raf. | 1 images |
| Opuntia fragilis (Nutt.) Haw. | 164 images |
| Opuntia macrorhiza Engelm. | 69 images |
| Opuntia orbiculata Salm-Dyck ex Pfeiff. | 78 images |
| Opuntia phaeacantha Engelm. | 491 images |
| Opuntia polyacantha Haw. | 471 images |
| Orbexilum onobrychis (Nutt.) Rydb. | 1 images |
| Oreocarya thyrsiflora Greene | 3 images |
| Origanum vulgare L. | 19298 images |
| Ornithogalum nutans L. | 1263 images |
| Ornithogalum umbellatum L. | 8436 images |
| Orobanche fasciculata Nutt. | 136 images |
| Orobanche ludoviciana Nutt. | 8 images |
| Orobanche ramosa L. | 458 images |
| Orobanche uniflora L. | 114 images |
| Orthilia secunda (L.) House | 466 images |
| Orthocarpus luteus Nutt. | 4 images |
| Oryza sativa L. | 457 images |
| Osmorhiza berteroi DC. | 8 images |
| Osmorhiza claytonii (Michx.) C.B.Clarke | 25 images |
| Osmorhiza depauperata Phil. | 7 images |
| Osmorhiza longistylis (Torr.) DC. | 342 images |
| Osmunda claytoniana L. | 397 images |
| Osmunda spectabilis Willd. | 4 images |
| Osmundastrum cinnamomeum (L.) C.Presl | 154 images |
| Ostrya virginiana (Mill.) K.Koch | 323 images |
| Oxalis articulata Savigny | 5219 images |
| Oxalis corniculata L. | 9024 images |
| Oxalis dillenii Jacq. | 2433 images |
| Oxalis montana Raf. | 56 images |
| Oxalis stricta L. | 2344 images |
| Oxalis violacea L. | 573 images |
| Oxybasis chenopodioides (L.) S.Fuentes, Uotila & Borsch | 80 images |
| Oxybasis glauca (L.) S.Fuentes, Uotila & Borsch | 246 images |
| Oxybasis rubra (L.) S.Fuentes, Uotila & Borsch | 641 images |
| Oxybasis urbica (L.) S.Fuentes, Uotila & Borsch | 44 images |
| Oxydendrum arboreum (L.) DC. | 371 images |
| Oxypolis rigidior (L.) Raf. | 22 images |
| Oxyria digyna (L.) Hill | 398 images |
| Oxytropis campestris (L.) DC. | 526 images |
| Oxytropis deflexa (Pall.) DC. | 14 images |
| Oxytropis lambertii Pursh | 48 images |
| Oxytropis splendens Douglas | 16 images |
| Pachysandra procumbens Michx. | 50 images |
| Pachysandra terminalis Siebold & Zucc. | 1594 images |
| Packera aurea (L.) Á.Löve & D.Löve | 159 images |
| Packera dubia (Spreng.) Trock & Mabb. | 8 images |
| Packera glabella (Poir.) C.Jeffrey | 232 images |
| Palafoxia rosea (Bush) Cory | 13 images |
| Palafoxia sphacelata (Nutt. ex Torr.) Cory | 8 images |
| Palustricodon aparinoides (Pursh) Morin | 20 images |
| Panax quinquefolius L. | 96 images |
| Panax trifolius L. | 145 images |
| Pancratium maritimum L. | 4822 images |
| Panicum capillare L. | 663 images |
| Panicum dichotomiflorum Michx. | 79 images |
| Panicum miliaceum L. | 1212 images |
| Panicum virgatum L. | 933 images |
| Papaver dubium L. | 3650 images |
| Papaver orientale L. | 4323 images |
| Papaver rhoeas L. | 12033 images |
| Papaver somniferum L. | 10162 images |
| Parentucellia viscosa (L.) Caruel | 960 images |
| Parietaria pensylvanica Muhl. ex Willd. | 181 images |
| Parnassia glauca Raf. | 35 images |
| Parnassia grandifolia DC. | 8 images |
| Parnassia palustris L. | 4234 images |
| Paronychia fastigiata (Raf.) Fernald | 7 images |
| Paronychia sessiliflora Nutt. | 3 images |
| Paronychia virginica Spreng. | 12 images |
| Parthenium hysterophorus L. | 1086 images |
| Parthenium integrifolium L. | 187 images |
| Parthenocissus quinquefolia (L.) Planch. | 15663 images |
| Parthenocissus tricuspidata (Siebold & Zucc.) Planch. | 3860 images |
| Parthenocissus vitacea (Knerr) Hitchc. | 3 images |
| Paspalum bifidum (Bertol.) Nash | 7 images |
| Paspalum dilatatum Poir. | 1172 images |
| Paspalum distichum L. | 256 images |
| Paspalum floridanum Michx. | 5 images |
| Paspalum notatum Flüggé | 42 images |
| Paspalum repens P.J.Bergius | 167 images |
| Paspalum setaceum Michx. | 13 images |
| Paspalum urvillei Steud. | 90 images |
| Passiflora incarnata L. | 493 images |
| Passiflora lutea L. | 297 images |
| Pastinaca sativa L. | 6278 images |
| Paulownia tomentosa (Thunb.) Steud. | 8968 images |
| Pectiantia pentandra (Hook.) Rydb. | 22 images |
| Pectis angustifolia Torr. | 6 images |
| Pedicularis canadensis L. | 199 images |
| Pedicularis crenulata Benth. | 6 images |
| Pedicularis lanceolata Michx. | 22 images |
| Pedicularis procera A.Gray | 4 images |
| Pediocactus simpsonii (Engelm.) Britton & Rose | 21 images |
| Pediomelum rhombifolium (Torr. & A.Gray) Rydb. | 1 images |
| Peltandra virginica (L.) Schott | 145 images |
| Penstemon albidus Nutt. | 10 images |
| Penstemon ambiguus Torr. | 19 images |
| Penstemon angustifolius Nutt. ex Pursh | 5 images |
| Penstemon arkansanus Pennell | 23 images |
| Penstemon buckleyi Pennell | 6 images |
| Penstemon calycosus Small | 28 images |
| Penstemon canescens Britton | 44 images |
| Penstemon cobaea Nutt. | 161 images |
| Penstemon digitalis Nutt. ex Sims | 1113 images |
| Penstemon eriantherus Nutt. ex Pursh | 8 images |
| Penstemon glaber Pursh | 20 images |
| Penstemon gracilis Nutt. | 19 images |
| Penstemon haydenii S.Watson ex J.M.Coult. | 2 images |
| Penstemon hirsutus (L.) Willd. | 140 images |
| Penstemon jamesii Benth. | 14 images |
| Penstemon laevigatus Aiton | 5 images |
| Penstemon laxiflorus Pennell | 15 images |
| Penstemon murrayanus Hook. | 8 images |
| Penstemon nitidus Douglas ex Benth. | 16 images |
| Penstemon pallidus Small | 33 images |
| Penstemon procerus Douglas ex Graham | 63 images |
| Penstemon tenuis Small | 37 images |
| Penthorum sedoides L. | 44 images |
| Pericome caudata A.Gray | 16 images |
| Perideridia gairdneri (Hook. & Arn.) Mathias | 2 images |
| Perilla frutescens (L.) Britton | 2437 images |
| Periploca graeca L. | 311 images |
| Persicaria amphibia (L.) Delarbre | 393 images |
| Persicaria careyi (Olney) Greene | 1 images |
| Persicaria glabra (Willd.) M.Gómez | 18 images |
| Persicaria hydropiper (L.) Delarbre | 649 images |
| Persicaria hydropiperoides (Michx.) Small | 18 images |
| Persicaria lapathifolia (L.) Delarbre | 3167 images |
| Persicaria longiseta (Bruijn) Kitag. | 7 images |
| Persicaria maculosa Gray | 9311 images |
| Persicaria minor (Huds.) Opiz | 304 images |
| Persicaria orientalis (L.) Spach | 2695 images |
| Persicaria pensylvanica (L.) M.Gómez | 50 images |
| Persicaria punctata (Elliott) Small | 77 images |
| Persicaria sagittata (L.) H.Gross | 19 images |
| Persicaria virginiana (L.) Gaertn. | 1013 images |
| Petasites frigidus (L.) Fr. | 233 images |
| Petrophytum caespitosum (Nutt.) Rydb. | 22 images |
| Petrorhagia dubia (Raf.) G.López & Romo | 62 images |
| Petrorhagia prolifera (L.) P.W.Ball & Heywood | 1183 images |
| Petrorhagia saxifraga (L.) Link | 1682 images |
| Petrosedum ochroleucum (Chaix) Niederle | 809 images |
| Petrosedum rupestre (L.) P.V.Heath | 5888 images |
| Petroselinum crispum (Mill.) Fuss | 2511 images |
| Petunia axillaris (Lam.) Britton, Sterns & Poggenb. | 77 images |
| Petunia integrifolia (Hook.) Schinz & Thell. | 113 images |
| Phacelia bipinnatifida Michx. | 120 images |
| Phacelia congesta Hook. | 60 images |
| Phacelia distans Benth. | 146 images |
| Phacelia hastata Douglas ex Lehm. | 88 images |
| Phacelia hirsuta Nutt. | 11 images |
| Phacelia integrifolia Torr. | 19 images |
| Phacelia linearis (Pursh) Holz. | 59 images |
| Phacelia purshii Buckley | 111 images |
| Phacelia tanacetifolia Benth. | 15824 images |
| Phalaris arundinacea L. | 2792 images |
| Phalaris brachystachys Link | 9 images |
| Phalaris canariensis L. | 454 images |
| Phaseolus polystachios (L.) Britton, Sterns & Poggenb. | 3 images |
| Phaseolus vulgaris L. | 2685 images |
| Phedimus aizoon (L.) 't Hart | 1017 images |
| Phedimus spurius (M.Bieb.) 't Hart | 4105 images |
| Phegopteris connectilis (Michx.) Watt | 709 images |
| Phellodendron amurense Rupr. | 324 images |
| Phemeranthus calycinus (Engelm.) Kiger | 12 images |
| Phemeranthus parviflorus (Nutt.) Kiger | 7 images |
| Philadelphus coronarius L. | 18979 images |
| Philadelphus inodorus L. | 170 images |
| Philadelphus pubescens Loisel. | 844 images |
| Phleum alpinum L. | 313 images |
| Phleum pratense L. | 2553 images |
| Phlox amplifolia Britton | 16 images |
| Phlox carolina L. | 42 images |
| Phlox cuspidata Scheele | 9 images |
| Phlox diffusa Benth. | 188 images |
| Phlox divaricata L. | 1017 images |
| Phlox drummondii Hook. | 1415 images |
| Phlox glaberrima L. | 44 images |
| Phlox hoodii Richardson | 72 images |
| Phlox maculata L. | 1506 images |
| Phlox paniculata L. | 5996 images |
| Phlox pilosa L. | 175 images |
| Phlox subulata L. | 4975 images |
| Phoradendron leucarpum (Raf.) Reveal & M.C.Johnst. | 3 images |
| Phragmites australis (Cav.) Trin. ex Steud. | 6448 images |
| Phryma leptostachya L. | 156 images |
| Phyla cuneifolia (Torr.) Greene | 1 images |
| Phyla lanceolata (Michx.) Greene | 124 images |
| Phyla nodiflora (L.) Greene | 1497 images |
| Phyllanthus caroliniensis Walter | 18 images |
| Phyllanthus polygonoides Nutt. ex Spreng. | 29 images |
| Phyllanthus tenellus Roxb. | 750 images |
| Phyllanthus urinaria L. | 475 images |
| Physalis acutifolia (Miers) Sandwith | 3 images |
| Physalis angulata L. | 1005 images |
| Physalis heterophylla Nees | 124 images |
| Physalis longifolia Nutt. | 221 images |
| Physalis mollis Nutt. | 8 images |
| Physalis philadelphica Lam. | 662 images |
| Physalis pubescens L. | 172 images |
| Physalis pumila Nutt. | 10 images |
| Physalis virginiana Mill. | 2 images |
| Physaria fendleri (A.Gray) O'Kane & Al-Shehbaz | 1 images |
| Physocarpus monogynus (Torr.) J.M.Coult. | 2 images |
| Physocarpus opulifolius (L.) Maxim. | 4514 images |
| Physostegia angustifolia Fernald | 9 images |
| Physostegia virginiana (L.) Benth. | 2009 images |
| Phytolacca acinosa Roxb. | 4406 images |
| Phytolacca americana L. | 18436 images |
| Phytolacca octandra L. | 21 images |
| Picea × albertiana S.Br. | 4 images |
| Picea abies (L.) H.Karst. | 9982 images |
| Picea laxa (Münchh.) Sarg. | 1766 images |
| Picea mariana (Mill.) Britton, Sterns & Poggenb. | 63 images |
| Picea pungens Engelm. | 5352 images |
| Picris hieracioides L. | 4302 images |
| Picris rhagadioloides (L.) Desf. | 7 images |
| Pilea fontana (Lunell) Rydb. | 1 images |
| Pilea pumila A.Gray | 483 images |
| Pilosella aurantiaca (L.) F.W.Schultz & Sch.Bip. | 7848 images |
| Pilosella caespitosa (Dumort.) P.D.Sell & C.West | 252 images |
| Pilosella officinarum Vaill. | 1998 images |
| Pilosella piloselloides (Vill.) Soják | 244 images |
| Pilularia americana A.Braun | 1 images |
| Pimpinella saxifraga L. | 1788 images |
| Pinaropappus roseus (Less.) Less. | 38 images |
| Pinguicula pumila Michx. | 13 images |
| Pinguicula vulgaris L. | 1182 images |
| Pinus banksiana Lamb. | 381 images |
| Pinus contorta Douglas ex Loudon | 538 images |
| Pinus echinata Mill. | 133 images |
| Pinus edulis Engelm. | 136 images |
| Pinus flexilis E.James | 57 images |
| Pinus nigra J.F.Arnold | 1905 images |
| Pinus ponderosa Douglas ex C.Lawson | 444 images |
| Pinus pungens Lamb. | 43 images |
| Pinus resinosa Aiton | 1371 images |
| Pinus rigida Mill. | 401 images |
| Pinus strobus L. | 4178 images |
| Pinus sylvestris L. | 10266 images |
| Pinus taeda L. | 369 images |
| Pinus virginiana Mill. | 110 images |
| Pinus wallichiana A.B.Jacks. | 1636 images |
| Pistacia chinensis Bunge | 242 images |
| Pistia stratiotes L. | 954 images |
| Plagiobothrys figuratus (Piper) I.M.Johnst. | 1 images |
| Plantago aristata Michx. | 25 images |
| Plantago cordata Lam. | 13 images |
| Plantago elongata Pursh | 15 images |
| Plantago eriopoda Torr. | 12 images |
| Plantago heterophylla Nutt. | 1 images |
| Plantago indica L. | 234 images |
| Plantago lanceolata L. | 13701 images |
| Plantago major L. | 10002 images |
| Plantago media L. | 4638 images |
| Plantago patagonica Jacq. | 50 images |
| Plantago pusilla Nutt. | 10 images |
| Plantago rhodosperma Decne. | 34 images |
| Plantago rugelii Decne. | 189 images |
| Plantago virginica L. | 179 images |
| Plantago wrightiana Decne. | 6 images |
| Platanthera aquilonis Sheviak | 21 images |
| Platanthera blephariglottis (Willd.) Lindl. | 36 images |
| Platanthera ciliaris (L.) Lindl. | 79 images |
| Platanthera clavellata (Michx.) Luer | 43 images |
| Platanthera dilatata (Pursh) Lindl. ex L.C.Beck | 4 images |
| Platanthera flava (L.) Lindl. | 17 images |
| Platanthera grandiflora (Bigelow) Lindl. | 11 images |
| Platanthera hookeri (Torr.) Lindl. | 1 images |
| Platanthera lacera (Michx.) G.Don | 39 images |
| Platanthera leucophaea (Nutt.) Lindl. | 11 images |
| Platanthera obtusata (Banks ex Pursh) Lindl. | 12 images |
| Platanthera orbiculata (Pursh) Lindl. | 44 images |
| Platanthera peramoena A.Gray | 10 images |
| Platanthera psycodes (L.) Lindl. | 84 images |
| Platanthera stricta Lindl. | 22 images |
| Platanus occidentalis L. | 7967 images |
| Plectocephalus americanus (Nutt.) D.Don | 4 images |
| Pluchea camphorata (L.) DC. | 49 images |
| Pluchea foetida (L.) DC. | 15 images |
| Pluchea odorata (L.) Cass. | 267 images |
| Poa angustifolia L. | 3 images |
| Poa annua L. | 2974 images |
| Poa arachnifera Torr. | 20 images |
| Poa arida Vasey | 2 images |
| Poa autumnalis Muhl. ex Elliott | 2 images |
| Poa bulbosa L. | 1169 images |
| Poa chaixii Vill. | 103 images |
| Poa compressa L. | 110 images |
| Poa cusickii Vasey | 7 images |
| Poa fendleriana (Steud.) Vasey | 12 images |
| Poa glauca Vahl | 40 images |
| Poa nemoralis L. | 391 images |
| Poa palustris L. | 125 images |
| Poa pratensis L. | 2830 images |
| Poa secunda J.Presl | 9 images |
| Poa trivialis L. | 1775 images |
| Podophyllum peltatum L. | 1922 images |
| Podostemum ceratophyllum Michx. | 3 images |
| Pogonia ophioglossoides (L.) Ker Gawl. | 106 images |
| Polemonium caeruleum L. | 1312 images |
| Polemonium micranthum Benth. | 4 images |
| Polemonium occidentale Greene | 103 images |
| Polemonium reptans L. | 424 images |
| Polygala alba Nutt. | 26 images |
| Polygala cruciata L. | 9 images |
| Polygala polygama Walter | 27 images |
| Polygala sanguinea L. | 60 images |
| Polygala senega L. | 27 images |
| Polygala verticillata L. | 5 images |
| Polygaloides paucifolia (Willd.) J.R.Abbott | 174 images |
| Polygonatum biflorum (Walter) Elliott | 695 images |
| Polygonatum pubescens (Willd.) Pursh | 158 images |
| Polygonum arenastrum Boreau | 170 images |
| Polygonum aviculare L. | 5017 images |
| Polygonum cilinode Michx. | 3 images |
| Polygonum douglasii Greene | 5 images |
| Polygonum tenue Michx. | 3 images |
| Polymnia canadensis L. | 134 images |
| Polypodium virginianum L. | 280 images |
| Polypogon monspeliensis (L.) Desf. | 800 images |
| Polypogon viridis (Gouan) Breistr. | 201 images |
| Polypremum procumbens L. | 82 images |
| Polystichum acrostichoides (Michx.) Schott | 603 images |
| Polystichum braunii (Spenn.) Fée | 166 images |
| Polystichum lonchitis (L.) Roth | 610 images |
| Polystichum munitum (Kaulf.) C.Presl | 916 images |
| Polytaenia nuttallii DC. | 16 images |
| Polytaenia texana (J.M.Coult. & Rose) Mathias & Constance | 88 images |
| Pombalia verticillata (Ortega) Paula-Souza | 9 images |
| Pontederia cordata L. | 1464 images |
| Pontederia crassipes Mart. | 1617 images |
| Populus × canescens (Aiton) Sm. | 1633 images |
| Populus alba L. | 11760 images |
| Populus angustifolia E.James | 5 images |
| Populus balsamifera L. | 1545 images |
| Populus deltoides W.Bartram ex Marshall | 547 images |
| Populus grandidentata Michx. | 297 images |
| Populus heterophylla L. | 24 images |
| Populus nigra L. | 13842 images |
| Populus tremuloides Michx. | 1350 images |
| Portulaca grandiflora Hook. | 7749 images |
| Portulaca halimoides L. | 31 images |
| Portulaca oleracea L. | 12313 images |
| Portulaca pilosa L. | 692 images |
| Portulaca umbraticola Kunth | 1485 images |
| Potamogeton alpinus Balb. | 23 images |
| Potamogeton amplifolius Tuck. | 7 images |
| Potamogeton berchtoldii Fieber | 24 images |
| Potamogeton crispus L. | 157 images |
| Potamogeton diversifolius Raf. | 1 images |
| Potamogeton epihydrus Raf. | 4 images |
| Potamogeton foliosus Raf. | 5 images |
| Potamogeton friesii Rupr. | 8 images |
| Potamogeton gramineus L. | 39 images |
| Potamogeton natans L. | 543 images |
| Potamogeton nodosus Poir. | 307 images |
| Potamogeton obtusifolius Mert. & W.D.J.Koch | 13 images |
| Potamogeton perfoliatus L. | 149 images |
| Potamogeton praelongus Wulfen | 22 images |
| Potamogeton pusillus L. | 42 images |
| Potentilla argentea L. | 2453 images |
| Potentilla biennis Greene | 2 images |
| Potentilla canadensis L. | 95 images |
| Potentilla concinna Richardson | 8 images |
| Potentilla gracilis Douglas ex Hook. | 181 images |
| Potentilla grandiflora L. | 346 images |
| Potentilla hippiana Lehm. | 10 images |
| Potentilla inclinata Vill. | 46 images |
| Potentilla indica (Andrews) Th.Wolf | 5182 images |
| Potentilla intermedia L. | 100 images |
| Potentilla norvegica L. | 673 images |
| Potentilla pensylvanica L. | 16 images |
| Potentilla plattensis Nutt. | 1 images |
| Potentilla recta L. | 3222 images |
| Potentilla reptans L. | 10239 images |
| Potentilla simplex Michx. | 455 images |
| Potentilla supina L. | 185 images |
| Primula fassettii A.R.Mast & Reveal | 2 images |
| Primula meadia (L.) A.R.Mast & Reveal | 261 images |
| Primula mistassinica Michx. | 4 images |
| Primula pauciflora (Durand) A.R.Mast & Reveal | 40 images |
| Proboscidea louisianica (Mill.) Thell. | 217 images |
| Prosartes trachycarpa S.Watson | 38 images |
| Proserpinaca palustris L. | 4 images |
| Prosopis glandulosa Torr. | 456 images |
| Prunella vulgaris L. | 18735 images |
| Prunus × subhirtella Miq. | 2148 images |
| Prunus americana Marshall | 61 images |
| Prunus angustifolia Marshall | 3 images |
| Prunus armeniaca L. | 5596 images |
| Prunus avium (L.) L. | 20038 images |
| Prunus cerasus L. | 10282 images |
| Prunus glandulosa Thunb. | 292 images |
| Prunus mahaleb L. | 6671 images |
| Prunus mexicana S.Watson | 9 images |
| Prunus nigra Aiton | 4 images |
| Prunus padus L. | 13677 images |
| Prunus pensylvanica L.f. | 399 images |
| Prunus persica (L.) Batsch | 10213 images |
| Prunus pumila L. | 22 images |
| Prunus rivularis Scheele | 25 images |
| Prunus serotina Ehrh. | 8277 images |
| Prunus susquehanae Willd. | 6 images |
| Prunus tomentosa Thunb. | 361 images |
| Prunus triloba Lindl. | 1237 images |
| Prunus virginiana L. | 2718 images |
| Psammophiliella muralis (L.) Ikonn. | 539 images |
| Pseudognaphalium canescens (DC.) Anderb. | 1 images |
| Pseudognaphalium obtusifolium (L.) Hilliard & B.L.Burtt | 68 images |
| Pseudognaphalium stramineum (Kunth) Anderb. | 101 images |
| Ptelea trifoliata L. | 427 images |
| Pteris multifida Poir. | 13 images |
| Pterospora andromedea Nutt. | 257 images |
| Ptilimnium nuttallii (DC.) Britton | 3 images |
| Puccinellia distans (Jacq.) Parl. | 92 images |
| Pueraria montana (Lour.) Merr. | 374 images |
| Purshia tridentata (Pursh) DC. | 175 images |
| Pycnanthemum albescens Torr. & A.Gray | 2 images |
| Pycnanthemum incanum (L.) Michx. | 111 images |
| Pycnanthemum muticum (Michx.) Pers. | 122 images |
| Pycnanthemum pycnanthemoides (Leavenw.) Fernald | 4 images |
| Pycnanthemum tenuifolium Schrad. | 244 images |
| Pycnanthemum verticillatum (Michx.) Pers. | 73 images |
| Pycnanthemum virginianum (L.) T.Durand & B.D.Jacks. ex B.L.Rob. & Fernald | 17 images |
| Pyracantha coccinea M.Roem. | 15409 images |
| Pyracantha koidzumii (Hayata) Rehder | 683 images |
| Pyrola americana G.Don | 23 images |
| Pyrola asarifolia Michx. | 106 images |
| Pyrola chlorantha Sw. | 309 images |
| Pyrola elliptica Nutt. | 141 images |
| Pyrola minor L. | 594 images |
| Pyrola picta Sm. | 124 images |
| Pyrrhopappus carolinianus (Walter) DC. | 261 images |
| Pyrrhopappus grandiflorus (Nutt.) Nutt. | 2 images |
| Pyrrocoma lanceolata (Hook.) Greene | 1 images |
| Pyrus betulifolia Bunge | 16 images |
| Pyrus calleryana Decne. | 4516 images |
| Pyrus communis L. | 10358 images |
| Pyrus pyrifolia (Burm.f.) Nakai | 452 images |
| Quercus × benderi Baen. | 3 images |
| Quercus × heterophylla F.Michx. | 6 images |
| Quercus × leana Nutt. | 6 images |
| Quercus × ludoviciana Sarg. | 1 images |
| Quercus × schochiana Dieck | 1 images |
| Quercus acutissima Carruth. | 261 images |
| Quercus alba L. | 701 images |
| Quercus bicolor Willd. | 605 images |
| Quercus buckleyi Nixon & Dorr | 8 images |
| Quercus coccinea Münchh. | 158 images |
| Quercus ellipsoidalis E.J.Hill | 21 images |
| Quercus falcata Michx. | 66 images |
| Quercus fusiformis Small | 183 images |
| Quercus gambelii Nutt. | 155 images |
| Quercus havardii Rydb. | 7 images |
| Quercus imbricaria Michx. | 222 images |
| Quercus lyrata Walter | 9 images |
| Quercus macrocarpa Michx. | 1270 images |
| Quercus marilandica (L.) Münchh. | 74 images |
| Quercus michauxii Nutt. | 155 images |
| Quercus montana Willd. | 8 images |
| Quercus muehlenbergii Engelm. | 53 images |
| Quercus nigra L. | 933 images |
| Quercus palustris Münchh. | 3759 images |
| Quercus phellos L. | 753 images |
| Quercus rubra L. | 11296 images |
| Quercus shumardii Buckley | 64 images |
| Quercus sinuata Walter | 6 images |
| Quercus stellata Wangenh. | 119 images |
| Quercus texana Buckley | 37 images |
| Quercus velutina Lam. | 1114 images |
| Quincula lobata (Torr.) Raf. | 52 images |
| Rabelera holostea (L.) M.T.Sharples & E.A.Tripp | 11073 images |
| Ranunculus abortivus L. | 493 images |
| Ranunculus acris L. | 11763 images |
| Ranunculus ambigens S.Watson | 5 images |
| Ranunculus arvensis L. | 450 images |
| Ranunculus bulbosus L. | 5037 images |
| Ranunculus fascicularis Muhl. ex Bigelow | 66 images |
| Ranunculus ficaria L. | 30668 images |
| Ranunculus flabellaris Raf. | 11 images |
| Ranunculus flammula L. | 1777 images |
| Ranunculus glaberrimus Hook. | 68 images |
| Ranunculus gmelinii DC. | 4 images |
| Ranunculus harveyi (A.Gray) Britton | 8 images |
| Ranunculus hispidus Michx. | 208 images |
| Ranunculus inamoenus Greene | 3 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 | 168 images |
| Ranunculus parviflorus Loefl. | 6 images |
| Ranunculus pensylvanicus L.f. | 2 images |
| Ranunculus pusillus Poir. | 5 images |
| Ranunculus recurvatus Poir. | 215 images |
| Ranunculus repens L. | 15075 images |
| Ranunculus reptans L. | 8 images |
| Ranunculus sardous Crantz | 872 images |
| Ranunculus sceleratus L. | 1410 images |
| Ranunculus trichophyllus Chaix | 480 images |
| Raphanus raphanistrum L. | 13495 images |
| Rapistrum rugosum (L.) All. | 3000 images |
| Ratibida columnifera (Nutt.) Wooton & Standl. | 427 images |
| Ratibida pinnata (Vent.) Barnhart | 319 images |
| Reseda alba L. | 1979 images |
| Reseda lutea L. | 5925 images |
| Reseda luteola L. | 2992 images |
| Reseda odorata L. | 74 images |
| Reynoutria × bohemica Chrtek & Chrtková | 101 images |
| Reynoutria japonica Houtt. | 10643 images |
| Reynoutria sachalinensis (F.Schmidt) Nakai | 2308 images |
| Rhamnus cathartica L. | 5227 images |
| Rhamnus davurica Pall. | 1 images |
| Rhamnus japonica Maxim. | 1 images |
| Rhamnus utilis Decne. | 7 images |
| Rhamphospermum arvense (L.) Andrz. ex Besser | 10213 images |
| Rhamphospermum nigrum (L.) Al-Shehbaz | 707 images |
| Rheum rhabarbarum L. | 590 images |
| Rhexia mariana L. | 196 images |
| Rhexia virginica L. | 114 images |
| Rhinanthus minor L. | 2697 images |
| Rhinotropis lindheimeri (A.Gray) J.R.Abbott | 1 images |
| Rhodiola integrifolia Raf. | 76 images |
| Rhododendron canescens (Michx.) Sweet | 186 images |
| Rhododendron groenlandicum (Oeder) Kron & Judd | 56 images |
| Rhododendron lapponicum (L.) Wahlenb. | 285 images |
| Rhododendron periclymenoides (Michx.) Shinners | 256 images |
| Rhododendron roseum (Loisel.) Rehder | 345 images |
| Rhododendron viscosum (L.) Torr. | 134 images |
| Rhodotypos scandens (Thunb.) Makino | 819 images |
| Rhus aromatica Aiton | 636 images |
| Rhus copallinum L. | 889 images |
| Rhus glabra L. | 1732 images |
| Rhus microphylla Engelm. | 32 images |
| Rhus trilobata Nutt. | 14 images |
| Rhus typhina L. | 10201 images |
| Rhynchosida physocalyx (A.Gray) Fryxell | 19 images |
| Rhynchospora alba (L.) Vahl | 181 images |
| Rhynchospora capitellata (Michx.) Vahl | 3 images |
| Rhynchospora fusca (L.) W.T.Aiton | 57 images |
| Rhynchospora glomerata (L.) Vahl | 1 images |
| Rhynchospora nivea Boeckeler | 1 images |
| Ribes americanum Mill. | 108 images |
| Ribes aureum Pursh | 1678 images |
| Ribes cereum Douglas | 147 images |
| Ribes cynosbati L. | 256 images |
| Ribes glandulosum Weber | 16 images |
| Ribes hirtellum Michx. | 5 images |
| Ribes hudsonianum Richardson | 5 images |
| Ribes lacustre (Pers.) Poir. | 84 images |
| Ribes missouriense Nutt. | 67 images |
| Ribes nigrum L. | 2842 images |
| Ribes oxyacanthoides L. | 2 images |
| Ribes rubrum L. | 5488 images |
| Ribes triste Pall. | 11 images |
| Ribes uva-crispa L. | 3199 images |
| Ricinus communis L. | 10937 images |
| Rivina humilis L. | 1033 images |
| Robinia hispida L. | 1381 images |
| Robinia pseudoacacia L. | 21857 images |
| Robinia viscosa Michx. ex Vent. | 1510 images |
| Rorippa aquatica (Eaton) E.J.Palmer & Steyerm. | 1 images |
| Rorippa austriaca (Crantz) Besser | 157 images |
| Rorippa curvipes Greene | 10 images |
| Rorippa indica (L.) Hiern | 1 images |
| Rorippa palustris (L.) Besser | 969 images |
| Rorippa sylvestris (L.) Besser | 2137 images |
| Rosa × dulcissima Lunell | 1 images |
| Rosa acicularis Lindl. | 24 images |
| Rosa arkansana Porter | 92 images |
| Rosa blanda Aiton | 23 images |
| Rosa canina L. | 21303 images |
| Rosa carolina L. | 29 images |
| Rosa gallica L. | 10548 images |
| Rosa glauca Pourr. | 855 images |
| Rosa lucieae Franch. & Rochebr. ex Crép. | 2446 images |
| Rosa micrantha Borrer ex Sm. | 782 images |
| Rosa moschata Herrm. | 354 images |
| Rosa multiflora Thunb. | 5105 images |
| Rosa palustris Marshall | 51 images |
| Rosa pendulina L. | 7347 images |
| Rosa rubiginosa L. | 3841 images |
| Rosa rugosa Thunb. | 9163 images |
| Rosa setigera Michx. | 272 images |
| Rosa spinosissima L. | 4199 images |
| Rosa virginiana Mill. | 144 images |
| Rosa woodsii Lindl. | 840 images |
| Rotala ramosior (L.) Koehne | 9 images |
| Rottboellia campestris Nutt. | 1 images |
| Rottboellia cochinchinensis (Lour.) Clayton | 26 images |
| Rubus allegheniensis Porter | 67 images |
| Rubus arcticus L. | 86 images |
| Rubus argutus Link | 1984 images |
| Rubus armeniacus Focke | 1052 images |
| Rubus caesius L. | 6706 images |
| Rubus canadensis L. | 187 images |
| Rubus chamaemorus L. | 325 images |
| Rubus deliciosus Torr. | 105 images |
| Rubus flagellaris Willd. | 36 images |
| Rubus hispidus L. | 92 images |
| Rubus idaeus L. | 7145 images |
| Rubus illecebrosus Focke | 56 images |
| Rubus nemoralis P.J.Müll. | 999 images |
| Rubus occidentalis L. | 2985 images |
| Rubus odoratus L. | 1448 images |
| Rubus parvifolius L. | 10 images |
| Rubus pensilvanicus Poir. | 42 images |
| Rubus phoenicolasius Maxim. | 1757 images |
| Rubus pubescens Raf. | 111 images |
| Rubus setosus Bigelow | 4 images |
| Rubus trivialis Michx. | 63 images |
| Rudbeckia amplexicaulis Vahl | 14 images |
| Rudbeckia fulgida Aiton | 6928 images |
| Rudbeckia grandiflora (Sweet) C.C.Gmel. ex DC. | 3 images |
| Rudbeckia hirta L. | 4646 images |
| Rudbeckia laciniata L. | 2406 images |
| Rudbeckia maxima Nutt. | 81 images |
| Rudbeckia missouriensis Engelm. ex C.L.Boynton & Beadle | 3 images |
| Rudbeckia subtomentosa Pursh | 108 images |
| Rudbeckia triloba L. | 1061 images |
| Ruellia caroliniensis (J.F.Gmel.) Steud. | 7 images |
| Ruellia humilis Nutt. | 514 images |
| Ruellia pedunculata Torr. ex A.Gray | 29 images |
| Ruellia strepens L. | 119 images |
| Rumex × acutus L. | 1523 images |
| Rumex acetosa L. | 6569 images |
| Rumex acetosella L. | 5114 images |
| Rumex alpinus L. | 1489 images |
| Rumex altissimus Alph.Wood | 12 images |
| Rumex confertus Willd. | 62 images |
| Rumex conglomeratus Murray | 2421 images |
| Rumex crispus L. | 9794 images |
| Rumex cristatus DC. | 115 images |
| Rumex dentatus L. | 18 images |
| Rumex hymenosepalus Torr. | 84 images |
| Rumex longifolius DC. | 1110 images |
| Rumex obtusifolius L. | 12721 images |
| Rumex occidentalis S.Watson | 4 images |
| Rumex patientia L. | 2940 images |
| Rumex pseudonatronatus (Borbás) Murb. | 5 images |
| Rumex pulcher L. | 2127 images |
| Rumex stenophyllus Ledeb. | 1 images |
| Rumex thyrsiflorus Fingerh. | 263 images |
| Rumex venosus Pursh | 12 images |
| Rumex verticillatus L. | 29 images |
| Ruppia cirrhosa (Petagna) Grande | 33 images |
| Ruta graveolens L. | 3216 images |
| Sabal minor (Jacq.) Pers. | 284 images |
| Sabatia angularis (L.) Pursh | 160 images |
| Sabatia campestris Nutt. | 133 images |
| Sabulina michauxii (Fenzl) Dillenb. & Kadereit | 6 images |
| Sacciolepis striata (L.) Nash | 1 images |
| Sagina apetala Ard. | 204 images |
| Sagina japonica (Sw.) Ohwi | 4 images |
| Sagina nodosa (L.) Fenzl | 119 images |
| Sagina procumbens L. | 937 images |
| Sagittaria graminea Michx. | 69 images |
| Sagittaria latifolia Willd. | 700 images |
| Sagittaria montevidensis Cham. & Schltdl. | 156 images |
| Sagittaria rigida Pursh | 8 images |
| Salicornia rubra A.Nelson | 14 images |
| Salix × fragilis L. | 113 images |
| Salix × pendulina Wender. | 583 images |
| Salix alba L. | 9971 images |
| Salix amygdaloides Andersson | 24 images |
| Salix atrocinerea Brot. | 3618 images |
| Salix babylonica L. | 6143 images |
| Salix bebbiana Sarg. | 29 images |
| Salix candida Flüggé ex Willd. | 4 images |
| Salix caprea L. | 12200 images |
| Salix caroliniana Michx. | 33 images |
| Salix cinerea L. | 5649 images |
| Salix daphnoides Vill. | 124 images |
| Salix discolor Muhl. | 456 images |
| Salix eleagnos Scop. | 2738 images |
| Salix eriocephala Michx. | 71 images |
| Salix exigua Nutt. | 231 images |
| Salix gooddingii C.R.Ball | 5 images |
| Salix humilis Marshall | 14 images |
| Salix interior Rowlee | 5 images |
| Salix lasiandra Benth. | 3 images |
| Salix lucida Muhl. | 63 images |
| Salix myricoides Muhl. | 1 images |
| Salix nigra Marshall | 115 images |
| Salix pentandra L. | 1053 images |
| Salix planifolia Pursh | 7 images |
| Salix purpurea L. | 3092 images |
| Salix pyrifolia Andersson | 2 images |
| Salix scouleriana Barratt ex Hook. | 20 images |
| Salix sericea Marshall | 11 images |
| Salix viminalis L. | 1782 images |
| Salsola tragus L. | 50 images |
| Salvia × sylvestris L. | 1257 images |
| Salvia azurea Michx. ex Vahl | 80 images |
| Salvia farinacea Benth. | 4868 images |
| Salvia lyrata L. | 792 images |
| Salvia nemorosa L. | 3346 images |
| Salvia nutans L. | 43 images |
| Salvia pratensis L. | 15543 images |
| Salvia reflexa Hornem. | 29 images |
| Salvia sclarea L. | 3639 images |
| Salvia splendens Sellow ex Nees | 1566 images |
| Salvia verticillata L. | 1725 images |
| Salvinia minima Baker | 56 images |
| Salvinia molesta D.Mitch. | 28 images |
| Sambucus canadensis L. | 4210 images |
| Sambucus cerulea Raf. | 9 images |
| Sambucus racemosa L. | 8487 images |
| Samolus ebracteatus Kunth | 14 images |
| Samolus parviflorus Raf. | 2 images |
| Sanguinaria canadensis L. | 1622 images |
| Sanguisorba canadensis L. | 151 images |
| Sanguisorba minor Scop. | 8538 images |
| Sanicula canadensis L. | 439 images |
| Sanicula marilandica L. | 22 images |
| Sanicula trifoliata E.P.Bicknell | 1 images |
| Saponaria officinalis L. | 15387 images |
| Sarcobatus vermiculatus (Hook.) Torr. | 42 images |
| Sarracenia purpurea L. | 1216 images |
| Sassafras albidum (Nutt.) Nees | 1417 images |
| Satureja hortensis L. | 1227 images |
| Saururus cernuus L. | 343 images |
| Saxifraga cernua L. | 28 images |
| Saxifraga paniculata Mill. | 2459 images |
| Scabiosa atropurpurea L. | 4956 images |
| Scandix pecten-veneris L. | 2711 images |
| Scheuchzeria palustris L. | 104 images |
| Schizachyrium scoparium (Michx.) Nash | 50 images |
| Schoenoplectiella hallii (A.Gray) Lye | 1 images |
| Schoenoplectiella mucronata (L.) J.Jung & H.K.Choi | 36 images |
| Schoenoplectiella purshiana (Fernald) Lye | 3 images |
| Schoenoplectus californicus (C.A.Mey.) Soják | 32 images |
| Schoenoplectus pungens (Vahl) Palla | 60 images |
| Schoenoplectus tabernaemontani (C.C.Gmel.) Palla | 82 images |
| Scilla luciliae (Boiss.) Speta | 3866 images |
| Scilla siberica Andrews | 2361 images |
| Scirpus atrovirens Willd. | 177 images |
| Scirpus cyperinus (L.) Kunth | 110 images |
| Scirpus hattorianus Makino | 4 images |
| Scirpus microcarpus J.Presl & C.Presl | 4 images |
| Scirpus pendulus Muhl. | 30 images |
| Scirpus polyphyllus Vahl | 4 images |
| Scleranthus annuus L. | 279 images |
| Scleranthus perennis L. | 506 images |
| Sclerochloa dura (L.) P.Beauv. | 57 images |
| Scorzonera laciniata L. | 600 images |
| Scorzoneroides autumnalis (L.) Moench | 2030 images |
| Scrophularia lanceolata Pursh | 13 images |
| Scrophularia marilandica L. | 50 images |
| Scrophularia nodosa L. | 3864 images |
| Scutellaria brittonii Porter | 2 images |
| Scutellaria drummondii Benth. | 49 images |
| Scutellaria galericulata L. | 1214 images |
| Scutellaria incana Biehler | 87 images |
| Scutellaria lateriflora L. | 84 images |
| Scutellaria nervosa Pursh | 1 images |
| Scutellaria ovata Hill | 78 images |
| Scutellaria parvula Michx. | 30 images |
| Scutellaria serrata Andrews | 22 images |
| Scutellaria wrightii A.Gray | 1 images |
| Secale cereale L. | 3345 images |
| Sedum acre L. | 7031 images |
| Sedum album L. | 9593 images |
| Sedum lanceolatum Torr. | 83 images |
| Sedum pulchellum Michx. | 49 images |
| Sedum sarmentosum Bunge | 733 images |
| Sedum sexangulare L. | 1940 images |
| Sedum ternatum Michx. | 336 images |
| Selaginella apoda (L.) Spring | 13 images |
| Selaginella selaginoides (L.) P.Beauv. ex Schrank & Mart. | 140 images |
| Selenia aurea Nutt. | 1 images |
| Sempervivum heuffelii Schott | 36 images |
| Senecio eremophilus Richardson | 2 images |
| Senecio flaccidus Less. | 138 images |
| Senecio hydrophilus Nutt. | 6 images |
| Senecio integerrimus Nutt. | 129 images |
| Senecio riddellii Torr. & A.Gray | 4 images |
| Senecio spartioides Torr. & A.Gray | 19 images |
| Senecio sylvaticus L. | 1751 images |
| Senecio viscosus L. | 737 images |
| Senecio vulgaris L. | 9272 images |
| Senna hebecarpa (Fernald) H.S.Irwin & Barneby | 9 images |
| Senna marilandica (L.) Link | 190 images |
| Senna obtusifolia (L.) H.S.Irwin & Barneby | 422 images |
| Senna occidentalis (L.) Link | 1354 images |
| Sesamum indicum L. | 359 images |
| Sesbania herbacea (Mill.) McVaugh | 107 images |
| Sesbania vesicaria (Jacq.) Elliott | 8 images |
| Sesuvium revolutifolium Ortega | 36 images |
| Setaria faberi R.A.W.Herrm. | 28 images |
| Setaria geminata (Forssk.) Veldkamp | 12 images |
| Setaria italica (L.) P.Beauv. | 1302 images |
| Setaria leucopila (Scribn. & Merr.) K.Schum. | 3 images |
| Setaria parviflora (Poir.) Kerguélen | 155 images |
| Setaria pumila (Poir.) Roem. & Schult. | 2513 images |
| Setaria verticillata (L.) P.Beauv. | 1206 images |
| Setaria viridis (L.) P.Beauv. | 149 images |
| Shepherdia argentea (Pursh) Nutt. | 51 images |
| Shepherdia canadensis (L.) Nutt. | 149 images |
| Sherardia arvensis L. | 3981 images |
| Sibbaldia tridentata (Aiton) Paule & Soják | 28 images |
| Sicyos angulatus L. | 402 images |
| Sida rhombifolia L. | 778 images |
| Sida spinosa L. | 151 images |
| Sideroxylon lanuginosum Michx. | 93 images |
| Sideroxylon lycioides L. | 16 images |
| Sigesbeckia orientalis L. | 183 images |
| Silene antirrhina L. | 14 images |
| Silene caroliniana Walter | 24 images |
| Silene chalcedonica (L.) E.H.L.Krause | 985 images |
| Silene conica L. | 533 images |
| Silene conoidea L. | 13 images |
| Silene coronaria (L.) Clairv. | 6175 images |
| Silene csereii Baumg. | 4 images |
| Silene dichotoma Ehrh. | 907 images |
| Silene dioica (L.) Clairv. | 17273 images |
| Silene flos-cuculi (L.) Greuter & Burdet | 7034 images |
| Silene gallica L. | 1711 images |
| Silene latifolia Poir. | 19242 images |
| Silene noctiflora L. | 1363 images |
| Silene ovata Pursh | 5 images |
| Silene regia Sims | 79 images |
| Silene stellata (L.) Coyte | 116 images |
| Silene virginica L. | 306 images |
| Silene vulgaris (Moench) Garcke | 14408 images |
| Silphium asteriscus L. | 71 images |
| Silphium integrifolium Michx. | 98 images |
| Silphium laciniatum L. | 231 images |
| Silphium perfoliatum L. | 1306 images |
| Silphium radula Nutt. | 33 images |
| Silphium terebinthinaceum Jacq. | 200 images |
| Silybum marianum (L.) Gaertn. | 9053 images |
| Sinapis alba L. | 6144 images |
| Sisymbrium altissimum L. | 304 images |
| Sisymbrium loeselii L. | 1266 images |
| Sisymbrium officinale (L.) Scop. | 5661 images |
| Sisyrinchium albidum Raf. | 36 images |
| Sisyrinchium angustifolium Mill. | 892 images |
| Sisyrinchium langloisii Greene | 55 images |
| Sisyrinchium montanum Greene | 157 images |
| Sisyrinchium mucronatum Michx. | 5 images |
| Sium suave Walter | 65 images |
| Smallanthus uvedalia (L.) Mack. | 64 images |
| Smilax bona-nox L. | 729 images |
| Smilax ecirrhata (Engelm. ex Kunth) S.Watson | 2 images |
| Smilax glauca Walter | 59 images |
| Smilax lasioneura Hook. | 13 images |
| Smilax laurifolia L. | 44 images |
| Smilax rotundifolia L. | 814 images |
| Smilax tamnoides L. | 157 images |
| Solanum aethiopicum L. | 138 images |
| Solanum alatum Moench | 3 images |
| Solanum americanum Mill. | 5571 images |
| Solanum carolinense L. | 1469 images |
| Solanum chenopodioides Lam. | 1879 images |
| Solanum citrullifolium A.Braun | 17 images |
| Solanum dimidiatum Raf. | 171 images |
| Solanum dulcamara L. | 13421 images |
| Solanum elaeagnifolium Cav. | 1532 images |
| Solanum lycopersicum L. | 15654 images |
| Solanum nigrum L. | 12751 images |
| Solanum physalifolium Rusby | 204 images |
| Solanum rostratum Dunal | 535 images |
| Solanum sarrachoides Sendtn. | 5 images |
| Solanum scabrum Mill. | 71 images |
| Solanum triflorum Nutt. | 57 images |
| Solanum tuberosum L. | 8463 images |
| Solanum villosum Mill. | 1913 images |
| Solidago × luteus (A.Perry) Brouillet & Semple | 4 images |
| Solidago altissima L. | 466 images |
| Solidago arguta Aiton | 6 images |
| Solidago bicolor L. | 108 images |
| Solidago caesia L. | 403 images |
| Solidago canadensis L. | 13501 images |
| Solidago drummondii Torr. & A.Gray | 1 images |
| Solidago flexicaulis L. | 340 images |
| Solidago gigantea Aiton | 5970 images |
| Solidago hispida Muhl. ex Willd. | 18 images |
| Solidago juncea Aiton | 426 images |
| Solidago missouriensis Nutt. | 23 images |
| Solidago mollis Bartl. | 5 images |
| Solidago nemoralis Aiton | 157 images |
| Solidago odora Aiton | 52 images |
| Solidago ohioensis Riddell | 7 images |
| Solidago patula Muhl. ex Willd. | 23 images |
| Solidago petiolaris Aiton | 10 images |
| Solidago ptarmicoides (Torr. & A.Gray) B.Boivin | 13 images |
| Solidago rigida L. | 145 images |
| Solidago rugosa Mill. | 984 images |
| Solidago sempervirens L. | 55 images |
| Solidago simplex Kunth | 16 images |
| Solidago speciosa Nutt. | 99 images |
| Solidago sphacelata Raf. | 2 images |
| Solidago uliginosa Nutt. | 31 images |
| Solidago ulmifolia Muhl. ex Willd. | 63 images |
| Soliva sessilis Ruiz & Pav. | 149 images |
| Sonchus arvensis L. | 4865 images |
| Sonchus asper (L.) Hill | 13077 images |
| Sonchus oleraceus L. | 13150 images |
| Sorbaria sorbifolia (L.) A.Braun | 2751 images |
| Sorbus americana Marshall | 198 images |
| Sorbus aucuparia L. | 18423 images |
| Sorbus decora (Sarg.) C.K.Schneid. | 16 images |
| Sorbus scopulina Greene | 51 images |
| Sorghastrum nutans (L.) Nash | 170 images |
| Sorghastrum secundum (Elliott) Nash | 2 images |
| Sorghum × drummondii (Nees ex Steud.) Millsp. & Chase | 3 images |
| Sorghum bicolor (L.) Moench | 2106 images |
| Sorghum halepense (L.) Pers. | 2781 images |
| Sparganium americanum Nutt. | 14 images |
| Sparganium androcladum (Engelm.) Morong | 3 images |
| Sparganium angustifolium Michx. | 262 images |
| Sparganium emersum Rehmann | 186 images |
| Sparganium eurycarpum Engelm. | 46 images |
| Sparganium natans L. | 50 images |
| Spergula arvensis L. | 1152 images |
| Spergularia marina (L.) Besser | 591 images |
| Spergularia media (L.) C.Presl | 313 images |
| Spergularia rubra (L.) J.Presl & C.Presl | 1391 images |
| Spermacoce glabra Michx. | 31 images |
| Sphaeralcea angustifolia (Cav.) G.Don | 21 images |
| Sphaeralcea coccinea (Nutt.) Rydb. | 159 images |
| Sphaeralcea fendleri A.Gray | 5 images |
| Sphenoclea zeylanica Gaertn. | 21 images |
| Sphenopholis intermedia (Rydb.) Rydb. | 9 images |
| Sphenopholis obtusata (Michx.) Scribn. | 9 images |
| Spigelia marilandica (L.) L. | 159 images |
| Spiraea alba Du Roi | 1927 images |
| Spiraea douglasii Hook. | 3363 images |
| Spiraea japonica L.f. | 10968 images |
| Spiraea prunifolia Siebold & Zucc. | 251 images |
| Spiraea thunbergii Siebold ex Blume | 2053 images |
| Spiraea tomentosa L. | 734 images |
| Spiranthes cernua (L.) Rich. | 159 images |
| Spiranthes diluvialis Sheviak | 5 images |
| Spiranthes lacera (Raf.) Raf. | 63 images |
| Spiranthes lucida (H.H.Eaton) Ames | 12 images |
| Spiranthes magnicamporum Sheviak | 26 images |
| Spiranthes odorata (Nutt.) Lindl. | 3 images |
| Spiranthes ovalis Lindl. | 26 images |
| Spiranthes praecox (Walter) S.Watson | 6 images |
| Spiranthes romanzoffiana Cham. | 90 images |
| Spiranthes tuberosa Raf. | 3 images |
| Spiranthes vernalis Engelm. & A.Gray | 59 images |
| Spirodela polyrhiza (L.) Schleid. | 181 images |
| Spirodela punctata (G.Mey.) C.H.Thomps. | 5 images |
| Sporobolus airoides (Torr.) Torr. | 24 images |
| Sporobolus cryptandrus (Torr.) A.Gray | 9 images |
| Sporobolus heterolepis (A.Gray) A.Gray | 15 images |
| Sporobolus hookerianus P.M.Peterson & Saarela | 4 images |
| Sporobolus indicus (L.) R.Br. | 395 images |
| Sporobolus michauxianus (Hitchc.) P.M.Peterson & Saarela | 62 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. | 521 images |
| Stachys byzantina K.Koch | 7302 images |
| Stachys palustris L. | 4870 images |
| Stachys pilosa Nutt. | 16 images |
| Stachys tenuifolia Willd. | 10 images |
| Stanleya pinnata (Pursh) Britton | 93 images |
| Staphylea trifolia L. | 276 images |
| Steinchisma hians (Elliott) Nash | 4 images |
| Stellaria alsine Grimm | 233 images |
| Stellaria apetala Ucria | 193 images |
| Stellaria aquatica (L.) Scop. | 1477 images |
| Stellaria borealis Bigelow | 3 images |
| Stellaria crassifolia Ehrh. | 20 images |
| Stellaria graminea L. | 3903 images |
| Stellaria longifolia Muhl. ex Willd. | 9 images |
| Stellaria longipes Goldie | 20 images |
| Stellaria media (L.) Vill. | 12183 images |
| Stellaria palustris Ehrh. ex Hoffm. | 4451 images |
| Stellaria pubera Michx. | 252 images |
| Stenanthium gramineum (Ker Gawl.) Morong | 18 images |
| Stenaria nigricans (Lam.) Terrell | 104 images |
| Stenotaphrum secundatum (Walter) Kuntze | 476 images |
| Stenotus armerioides Nutt. | 12 images |
| Stillingia sylvatica L. | 29 images |
| Streptopus amplexifolius (L.) DC. | 541 images |
| Streptopus lanceolatus (Aiton) Reveal | 94 images |
| Strigosella africana (L.) Botsch. | 158 images |
| Strophostyles helvola (L.) Elliott | 74 images |
| Stuckenia filiformis (Pers.) Börner | 4 images |
| Stuckenia pectinata (L.) Börner | 103 images |
| Stylophorum diphyllum (Michx.) Nutt. | 417 images |
| Styrax americanus Lam. | 25 images |
| Styrax grandifolius Aiton | 3 images |
| Subularia aquatica L. | 26 images |
| Symphoricarpos albus (L.) S.F.Blake | 9651 images |
| Symphoricarpos occidentalis (R.Br.) Hook. | 57 images |
| Symphoricarpos orbiculatus Moench | 3037 images |
| Symphoricarpos rotundifolius A.Gray | 42 images |
| Symphyotrichum × salignum (Willd.) G.L.Nesom | 238 images |
| Symphyotrichum cordifolium (L.) G.L.Nesom | 733 images |
| Symphyotrichum drummondii (Lindl.) G.L.Nesom | 1 images |
| Symphyotrichum dumosum (L.) G.L.Nesom | 51 images |
| Symphyotrichum ericoides (L.) G.L.Nesom | 1498 images |
| Symphyotrichum laeve (L.) Á.Löve & D.Löve | 166 images |
| Symphyotrichum lanceolatum (Willd.) G.L.Nesom | 2867 images |
| Symphyotrichum lateriflorum (L.) Á.Löve & D.Löve | 64 images |
| Symphyotrichum novae-angliae (L.) G.L.Nesom | 2515 images |
| Symphyotrichum oblongifolium (Nutt.) G.L.Nesom | 43 images |
| Symphyotrichum ontarionis (Wiegand) G.L.Nesom | 7 images |
| Symphyotrichum oolentangiense (Riddell) G.L.Nesom | 212 images |
| Symphyotrichum patens (Aiton) G.L.Nesom | 2 images |
| Symphyotrichum pilosum (Willd.) G.L.Nesom | 284 images |
| Symphyotrichum praealtum (Poir.) G.L.Nesom | 5 images |
| Symphyotrichum puniceum (L.) Á.Löve & D.Löve | 96 images |
| Symphyotrichum racemosum (Elliott) G.L.Nesom | 7 images |
| Symphyotrichum sericeum (Vent.) G.L.Nesom | 10 images |
| Symphyotrichum shortii (Lindl.) G.L.Nesom | 9 images |
| Symphyotrichum subulatum (Michx.) G.L.Nesom | 719 images |
| Symphytum asperum Lepech. | 2222 images |
| Symphytum officinale L. | 18808 images |
| Symplocarpus foetidus (L.) Salisb. ex W.P.C.Barton | 503 images |
| Symplocos tinctoria (L.) L'Hér. | 5 images |
| Synandra hispidula (Michx.) Baill. | 2 images |
| Syringa pubescens Turcz. | 982 images |
| Syringa vulgaris L. | 19960 images |
| Taenidia integerrima (L.) Drude | 43 images |
| Tagetes erecta L. | 13256 images |
| Tamarix chinensis Lour. | 159 images |
| Tamarix gallica L. | 5849 images |
| Tamarix parviflora DC. | 3074 images |
| Tamarix ramosissima Ledeb. | 1509 images |
| Tanacetum balsamita L. | 513 images |
| Tanacetum bipinnatum Sch.Bip. | 28 images |
| Tanacetum parthenium (L.) Sch.Bip. | 7849 images |
| Tanacetum vulgare L. | 16730 images |
| Taraxacum erythrospermum Andrz. ex Besser | 1076 images |
| Taraxacum sect. Taraxacum F.H.Wigg. | 14239 images |
| Taxodium distichum (L.) Rich. | 8128 images |
| Taxus canadensis Marshall | 1074 images |
| Tephrosia onobrychoides Nutt. | 2 images |
| Tephrosia virginiana (L.) Pers. | 69 images |
| Tetragonia tetragonoides (Pall.) Kuntze | 559 images |
| Tetraneuris acaulis Greene | 25 images |
| Tetraneuris herbacea Greene | 9 images |
| Tetraneuris linearifolia Greene | 25 images |
| Tetraneuris scaposa (DC.) Greene | 126 images |
| Teucrium canadense L. | 559 images |
| Teucrium laciniatum Torr. | 24 images |
| Thalia dealbata Fraser | 312 images |
| Thalictrum dasycarpum Fisch., C.A.Mey. & Avé-Lall. | 9 images |
| Thalictrum dioicum L. | 468 images |
| Thalictrum fendleri Engelm. ex A.Gray | 54 images |
| Thalictrum occidentale A.Gray | 35 images |
| Thalictrum pubescens Pursh | 453 images |
| Thalictrum revolutum DC. | 20 images |
| Thaspium barbinode (Michx.) Nutt. | 33 images |
| Thaspium trifoliatum (L.) A.Gray | 22 images |
| Thelesperma filifolium (Hook.) A.Gray | 4 images |
| Thelesperma megapotamicum (Spreng.) Herter | 43 images |
| Thelypodium integrifolium (Nutt.) Endl. | 2 images |
| Thelypteris noveboracensis (L.) Nieuwl. | 243 images |
| Thelypteris palustris Schott | 308 images |
| Thesium ramosum Hayne | 4 images |
| Thinopyrum elongatum (Host) D.R.Dewey | 21 images |
| Thinopyrum intermedium (Host) Barkworth & D.R.Dewey | 19 images |
| Thladiantha dubia Bunge | 112 images |
| Thlaspi arvense L. | 2622 images |
| Thuja occidentalis L. | 6886 images |
| Thymelaea passerina (L.) Coss. & Germ. | 62 images |
| Thymus praecox Opiz | 2005 images |
| Thymus pulegioides L. | 2125 images |
| Tiarella stolonifera G.L.Nesom | 2 images |
| Tidestromia lanuginosa (Nutt.) Standl. | 25 images |
| Tilia × europaea L. | 3783 images |
| Tilia americana L. | 4335 images |
| Tilia cordata Mill. | 10939 images |
| Tipularia discolor (Pursh) Nutt. | 328 images |
| Tofieldia pusilla (Michx.) Pers. | 87 images |
| Tomostima cuneifolia (Nutt.) Al-Shehbaz, M.Koch & Jordon-Thaden | 1 images |
| Torenia fournieri Linden ex E.Fourn. | 46 images |
| Torilis arvensis (Huds.) Link | 4525 images |
| Torilis japonica (Houtt.) DC. | 1408 images |
| Torilis nodosa (L.) Gaertn. | 851 images |
| Torreyochloa pallida (Torr.) Church | 10 images |
| Townsendia exscapa (Richardson) Porter | 11 images |
| Townsendia hookeri Beaman | 10 images |
| Toxicodendron pubescens Mill. | 44 images |
| Toxicodendron radicans (L.) Kuntze | 4735 images |
| Toxicodendron rydbergii (Small ex Rydb.) Greene | 119 images |
| Toxicodendron vernix (L.) Kuntze | 67 images |
| Toxicoscordion venenosum (S.Watson) Rydb. | 38 images |
| Tradescantia bracteata Small ex Britton | 4 images |
| Tradescantia hirsutiflora Bush | 7 images |
| Tradescantia occidentalis (Britton) Smyth | 95 images |
| Tradescantia ohiensis Raf. | 809 images |
| Tradescantia subaspera Ker Gawl. | 54 images |
| Tradescantia virginiana L. | 4754 images |
| Tragia cordata Michx. | 13 images |
| Tragia ramosa Torr. | 38 images |
| Tragopogon dubius Scop. | 5599 images |
| Tragopogon porrifolius L. | 4751 images |
| Tragopogon pratensis L. | 7942 images |
| Trautvetteria caroliniensis (Walter) Vail | 34 images |
| Triantha glutinosa (Michx.) Baker | 39 images |
| Trianthema portulacastrum L. | 271 images |
| Tribulus terrestris L. | 2111 images |
| Trichophorum alpinum (L.) Pers. | 121 images |
| Trichophorum cespitosum (L.) Hartm. | 350 images |
| Trichostema brachiatum L. | 24 images |
| Trichostema dichotomum L. | 125 images |
| Trichostema setaceum Houtt. | 4 images |
| Tridens albescens (Vasey) Wooton & Standl. | 5 images |
| Tridens flavus (L.) Hitchc. | 62 images |
| Tridens strictus (Nutt.) Nash | 2 images |
| Tridentopsis mutica (Torr.) P.M.Peterson | 3 images |
| Trifolium arvense L. | 3259 images |
| Trifolium attenuatum Greene | 4 images |
| Trifolium aureum Pollich | 790 images |
| Trifolium campestre Schreb. | 3745 images |
| Trifolium dubium Sibth. | 3048 images |
| Trifolium fragiferum L. | 1115 images |
| Trifolium hybridum L. | 1431 images |
| Trifolium incarnatum L. | 6760 images |
| Trifolium pratense L. | 17411 images |
| Trifolium reflexum L. | 2 images |
| Trifolium repens L. | 11961 images |
| Trifolium resupinatum L. | 1352 images |
| Trifolium stoloniferum Muhl. | 1 images |
| Trifolium striatum L. | 235 images |
| Triglochin maritima L. | 359 images |
| Triglochin palustris L. | 141 images |
| Trillium cernuum L. | 72 images |
| Trillium cuneatum Raf. | 296 images |
| Trillium erectum L. | 1028 images |
| Trillium flexipes Raf. | 69 images |
| Trillium grandiflorum (Michx.) Salisb. | 958 images |
| Trillium nivale Riddell | 30 images |
| Trillium pusillum Michx. | 3 images |
| Trillium recurvatum L.C.Beck | 11 images |
| Trillium sessile L. | 308 images |
| Trillium viridescens Nutt. | 6 images |
| Triodanis perfoliata (L.) Nieuwl. | 563 images |
| Triosteum angustifolium L. | 9 images |
| Triosteum aurantiacum E.P.Bicknell | 6 images |
| Triosteum perfoliatum L. | 50 images |
| Triphora trianthophoros (Sw.) Rydb. | 9 images |
| Tripidium ravennae (L.) H.Scholz | 89 images |
| Triplasis purpurea (Walter) Chapm. | 3 images |
| Tripleurospermum inodorum (L.) Sch.Bip. | 1396 images |
| Tripleurospermum maritimum (L.) W.D.J.Koch | 703 images |
| Tripsacum dactyloides (L.) L. | 77 images |
| Trisetum flavescens (L.) P.Beauv. | 548 images |
| Triticum aestivum L. | 21276 images |
| Tsuga canadensis (L.) Carrière | 1292 images |
| Tulipa sylvestris L. | 3801 images |
| Turritis glabra L. | 842 images |
| Tussilago farfara L. | 11667 images |
| Typha × glauca Godr. | 49 images |
| Typha angustifolia L. | 998 images |
| Typha domingensis Pers. | 202 images |
| Typha latifolia L. | 3339 images |
| Ulmus alata Michx. | 497 images |
| Ulmus americana L. | 4325 images |
| Ulmus crassifolia Nutt. | 196 images |
| Ulmus glabra Huds. | 7357 images |
| Ulmus minor Mill. | 14418 images |
| Ulmus pumila L. | 2840 images |
| Ulmus rubra Muhl. | 134 images |
| Ulmus serotina Sarg. | 29 images |
| Ulmus thomasii Sarg. | 160 images |
| Urochloa fusca (Sw.) B.F.Hansen & Wunderlin | 16 images |
| Urochloa ramosa (L.) T.Q.Nguyen | 7 images |
| Urtica chamaedryoides Pursh | 42 images |
| Urtica dioica L. | 14218 images |
| Urtica gracilis Aiton | 1 images |
| Urtica urens L. | 4165 images |
| Utricularia geminiscapa Benj. | 10 images |
| Utricularia gibba L. | 43 images |
| Utricularia inflata Walter | 2 images |
| Utricularia intermedia Hayne | 80 images |
| Utricularia minor L. | 130 images |
| Utricularia ochroleuca R.W.Hartm. | 13 images |
| Utricularia purpurea Walter | 12 images |
| Utricularia radiata Small | 12 images |
| Utricularia striata Leconte ex Torr. | 8 images |
| Utricularia subulata L. | 33 images |
| Uvularia grandiflora Sm. | 253 images |
| Uvularia sessilifolia L. | 128 images |
| Vaccinium angustifolium Aiton | 648 images |
| Vaccinium arboreum Marshall | 165 images |
| Vaccinium cespitosum Michx. | 3 images |
| Vaccinium corymbosum L. | 2406 images |
| Vaccinium macrocarpon Aiton | 313 images |
| Vaccinium membranaceum Douglas ex Torr. | 61 images |
| Vaccinium myrtilloides Michx. | 41 images |
| Vaccinium ovalifolium Sm. | 40 images |
| Vaccinium oxycoccos L. | 446 images |
| Vaccinium pallidum Aiton | 150 images |
| Vaccinium scoparium Leiberg ex Coville | 25 images |
| Vaccinium stamineum L. | 163 images |
| Vaccinium uliginosum L. | 1465 images |
| Vaccinium vitis-idaea L. | 2666 images |
| Valeriana acutiloba Rydb. | 2 images |
| Valeriana dioica L. | 3006 images |
| Valeriana locusta L. | 6297 images |
| Valeriana occidentalis A.Heller | 7 images |
| Valeriana officinalis L. | 7682 images |
| Valeriana pauciflora Michx. | 50 images |
| Valeriana sitchensis Bong. | 79 images |
| Valeriana umbilicata (Sull.) Christenh. & Byng | 13 images |
| Valeriana woodsiana (Torr. & A.Gray) Christenh. & Byng | 155 images |
| Vallisneria americana Michx. | 8 images |
| Verbascum blattaria L. | 3173 images |
| Verbascum densiflorum Bertol. | 6176 images |
| Verbascum lychnitis L. | 3417 images |
| Verbascum nigrum L. | 8925 images |
| Verbascum phlomoides L. | 2837 images |
| Verbascum speciosum Schrad. | 390 images |
| Verbascum thapsus L. | 16216 images |
| Verbascum virgatum Stokes | 1394 images |
| Verbena bipinnatifida Schauer | 397 images |
| Verbena bonariensis L. | 8281 images |
| Verbena bracteata Cav. ex Lag. & Rodr. | 36 images |
| Verbena brasiliensis Vell. | 700 images |
| Verbena canadensis (L.) Britton | 137 images |
| Verbena halei Small | 179 images |
| Verbena hastata L. | 1020 images |
| Verbena incompta P.W.Michael | 5 images |
| Verbena litoralis Kunth | 101 images |
| Verbena officinalis L. | 7233 images |
| Verbena peruviana (L.) Britton | 158 images |
| Verbena pumila Rydb. | 33 images |
| Verbena rigida Spreng. | 1581 images |
| Verbena simplex Lehm. | 67 images |
| Verbena stricta Vent. | 314 images |
| Verbena urticifolia L. | 751 images |
| Verbena xutha Lehm. | 4 images |
| Verbesina alternifolia (L.) Britton ex Kearney | 562 images |
| Verbesina encelioides (Cav.) Benth. & Hook.f. ex A.Gray | 477 images |
| Verbesina helianthoides Michx. | 22 images |
| Verbesina occidentalis Walter | 175 images |
| Verbesina virginica L. | 358 images |
| Verbesina walteri Shinners | 8 images |
| Vernonia arkansana DC. | 38 images |
| Vernonia baldwinii Torr. | 663 images |
| Vernonia fasciculata Michx. | 109 images |
| Vernonia gigantea (Walter) Trel. | 13 images |
| Vernonia marginata (Torr.) Raf. | 10 images |
| Vernonia missurica Raf. | 22 images |
| Vernonia texana (A.Gray) Small | 7 images |
| Veronica agrestis L. | 1447 images |
| Veronica anagallis-aquatica L. | 1517 images |
| Veronica arvensis L. | 3059 images |
| Veronica austriaca L. | 2234 images |
| Veronica beccabunga L. | 2510 images |
| Veronica bullii (Eaton) M.M.Mart.Ort. & Albach | 1 images |
| Veronica catenata Pennell | 108 images |
| Veronica chamaedrys L. | 18024 images |
| Veronica dillenii Crantz | 46 images |
| Veronica hederifolia L. | 3165 images |
| Veronica longifolia L. | 1588 images |
| Veronica officinalis L. | 3088 images |
| Veronica peregrina L. | 320 images |
| Veronica persica Poir. | 14289 images |
| Veronica polita Fr. | 2326 images |
| Veronica scutellata L. | 270 images |
| Veronica serpyllifolia L. | 3398 images |
| Veronica sublobata M.A.Fisch. | 809 images |
| Veronica teucrium L. | 700 images |
| Veronica triphyllos L. | 150 images |
| Veronica verna L. | 173 images |
| Veronicastrum virginicum (L.) Farw. | 1085 images |
| Vesper macrorhizus (Buckley) R.L.Hartm. & G.L.Nesom | 18 images |
| Viburnum acerifolium L. | 631 images |
| Viburnum cassinoides L. | 7 images |
| Viburnum dentatum L. | 575 images |
| Viburnum dilatatum Thunb. | 127 images |
| Viburnum edule (Michx.) Raf. | 20 images |
| Viburnum lantana L. | 13783 images |
| Viburnum lentago L. | 267 images |
| Viburnum opulus L. | 19301 images |
| Viburnum plicatum Thunb. | 4376 images |
| Viburnum prunifolium L. | 446 images |
| Viburnum rafinesqueanum Schult. | 3 images |
| Viburnum recognitum Fernald | 60 images |
| Viburnum rhytidophyllum Hemsl. | 5668 images |
| Viburnum rufidulum Raf. | 236 images |
| Viburnum trilobum Marshall | 1473 images |
| Vicia americana Muhl. ex Willd. | 71 images |
| Vicia caroliniana Walter | 49 images |
| Vicia cracca L. | 6956 images |
| Vicia hirsuta (L.) Gray | 2037 images |
| Vicia ludoviciana Nutt. | 28 images |
| Vicia sativa L. | 13561 images |
| Vicia tetrasperma (L.) Schreb. | 525 images |
| Vicia villosa Roth | 8404 images |
| Vigna unguiculata (L.) Walp. | 270 images |
| Vinca major L. | 16166 images |
| Vinca minor L. | 15530 images |
| Vincetoxicum nigrum (L.) Moench | 505 images |
| Vincetoxicum rossicum (Kleopow) Barbar. | 6 images |
| Viola adunca Sm. | 185 images |
| Viola arvensis Murray | 4952 images |
| Viola blanda Willd. | 263 images |
| Viola canadensis L. | 223 images |
| Viola cucullata Aiton | 27 images |
| Viola labradorica Schrank | 217 images |
| Viola lanceolata L. | 56 images |
| Viola macloskeyi F.E.Lloyd | 10 images |
| Viola nephrophylla Greene | 1 images |
| Viola nuttallii Pursh | 36 images |
| Viola odorata L. | 14662 images |
| Viola palmata L. | 19 images |
| Viola palustris L. | 998 images |
| Viola pedata L. | 166 images |
| Viola pedatifida G.Don | 17 images |
| Viola pubescens Aiton | 767 images |
| Viola renifolia A.Gray | 6 images |
| Viola rostrata Muhl. ex Pursh | 84 images |
| Viola sagittata Aiton | 103 images |
| Viola selkirkii Pursh ex Goldie | 9 images |
| Viola sororia Willd. | 1617 images |
| Viola striata Aiton | 262 images |
| Viola tricolor L. | 7920 images |
| Viola villosa Walter | 8 images |
| Viscaria vulgaris Röhl. | 13 images |
| Vitis aestivalis Michx. | 1308 images |
| Vitis cinerea (Engelm.) Millardet | 2 images |
| Vitis labrusca L. | 493 images |
| Vitis mustangensis Buckley | 197 images |
| Vitis riparia Michx. | 699 images |
| Vitis rotundifolia Michx. | 1466 images |
| Vitis rupestris Scheele | 38 images |
| Vitis vulpina L. | 977 images |
| Waldsteinia fragarioides (Michx.) Tratt. | 34 images |
| Wisteria floribunda (Willd.) DC. | 3121 images |
| Wisteria frutescens (L.) Poir. | 829 images |
| Wisteria sinensis (Sims) DC. | 1613 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 | 61 images |
| Woodsia ilvensis (L.) R.Br. | 93 images |
| Woodsia obtusa (Spreng.) Torr. | 12 images |
| Woodsia oregana D.C.Eaton | 14 images |
| Woodsia scopulina D.C.Eaton | 9 images |
| Woodwardia virginica (L.) Sm. | 18 images |
| Wyethia sagittata (Pursh) Mabb. | 224 images |
| Xanthisma texanum DC. | 13 images |
| Xanthium chinense Mill. | 1 images |
| Xanthium orientale L. | 453 images |
| Xanthium spinosum L. | 963 images |
| Xylorhiza glabriuscula Nutt. | 6 images |
| Xyris difformis Chapm. | 2 images |
| Xyris jupicai Rich. | 346 images |
| Xyris montana Ries | 3 images |
| Xyris torta Sm. | 7 images |
| Yucca arkansana Trel. | 60 images |
| Yucca flaccida Haw. | 232 images |
| Yucca glauca Nutt. | 162 images |
| Zannichellia palustris L. | 59 images |
| Zanthoxylum americanum Mill. | 216 images |
| Zanthoxylum clava-herculis L. | 150 images |
| Zea mays L. | 23885 images |
| Zeltnera texensis (Griseb.) G.Mans. ex J.S.Pringle | 1 images |
| Zephyranthes chlorosolen (Herb.) D.Dietr. | 1 images |
| Zinnia grandiflora Nutt. | 28 images |
| Zizania aquatica L. | 12 images |
| Zizia aptera (A.Gray) Fernald | 217 images |
| Zizia aurea (L.) W.D.J.Koch | 56 images |
| Zoysia japonica Steud. | 9 images |