Invasive plants Invasive species potentially threatening livelihoods and the environment around the worldExplore

• Families
• Genera
• Species 108

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Acanthospermum australe (Loefl.) Kuntze

Spiny-bur

91 56 Observations

Asteraceae

Acanthospermum hispidum DC.

Bristly starbur

112 77 Observations

Asteraceae

Achillea millefolium L.

Least Concern

Common yarrow

25,092 20,939 Observations

Asteraceae

Acmella uliginosa (Sw.) Cass.

Least Concern

Marsh para cress

64 34 Observations

Asteraceae

Ageratina adenophora (Spreng.) R.M.King & H.Rob.

Crofton weed

645 485 Observations

Asteraceae

Ageratina riparia (Regel) R.M.King & H.Rob.

Mistflower

528 253 Observations

Asteraceae

Ageratum conyzoides L.

Billy goat weed

555 431 Observations

Asteraceae

Ageratum houstonianum Mill.

Bluemink

3,087 2,646 Observations

Asteraceae

Ambrosia artemisiifolia L.

Annual ragweed

4,743 3,749 Observations

Asteraceae

Ambrosia psilostachya DC.

Perennial ragweed

359 268 Observations

Asteraceae

Ambrosia trifida L.

Giant Ragweed

976 803 Observations

Asteraceae

Anthemis cotula L.

Chamomile

1,487 1,171 Observations

Asteraceae

Arctotheca calendula (L.) Levyns

Capeweed

1,569 1,220 Observations

Asteraceae

Artemisia biennis Willd.

Biennial wormwood

132 72 Observations

Asteraceae

Baccharis halimifolia L.

Least Concern

Eastern baccharis

1,533 1,085 Observations

Asteraceae

Baccharis pilularis DC.

Coyote brush

707 643 Observations

Asteraceae

Bidens alba (L.) DC.

Romerillo

253 173 Observations

Asteraceae

Bidens frondosa L.

Least Concern

Devil's Beggarticks

2,736 1,967 Observations

Asteraceae

Bidens pilosa L.

Spanish-needles

2,853 2,083 Observations

Asteraceae

Carduus nutans L.

Nodding thistle

4,382 3,140 Observations

Asteraceae

Carduus pycnocephalus L.

Italian thistle

4,363 3,111 Observations

Asteraceae

Centaurea debeauxii Godr. & Gren.

Meadow knapweed

8 4 Observations

Asteraceae

Centaurea diffusa Lam.

Diffuse knapweed

192 130 Observations

Asteraceae

Centaurea iberica Trevir. ex Spreng.

Iberian knapweed

52 36 Observations

Asteraceae

Centaurea macrocephala Muss.Puschk. ex Willd.

Giant knapweed

440 347 Observations

Asteraceae

Centaurea melitensis L.

Maltese starthistle

760 535 Observations

Asteraceae

Centaurea solstitialis L.

Yellow starthistle

1,247 906 Observations

Asteraceae

Centaurea stoebe Tausch

Spotted knapweed

74 50 Observations

Asteraceae

Centratherum punctatum Cass.

Lark daisy

510 399 Observations

Asteraceae

Chondrilla juncea L.

Rush skeletonweed

1,900 1,229 Observations

Asteraceae

Chromolaena odorata (L.) R.M.King & H.Rob.

Hagonoy

887 620 Observations

Asteraceae

Chrysanthemoides monilifera (L.) Norl.

Least Concern

Boneseed

75 48 Observations

Asteraceae

Cichorium endivia L.

Endive Chicory

8,501 7,134 Observations

Asteraceae

Cirsium arvense (L.) Scop.

Field thistle

15,258 11,371 Observations

Asteraceae

Cirsium mexicanum DC.

Mexican thistle

32 14 Observations

Asteraceae

Cirsium vulgare (Savi) Ten.

Spear Thistle

19,782 15,010 Observations

Asteraceae

Conyza bonariensis (L.) Cronquist

Asthmaweed

498 328 Observations

Asteraceae

Conyza canadensis (L.) Cronquist

Canadian horseweed

3,615 2,726 Observations

Asteraceae

Cosmos caudatus Kunth

Cosmos

869 738 Observations

Asteraceae

Cosmos sulphureus Cav.

Orange cosmos

3,935 3,318 Observations

Asteraceae

Crassocephalum crepidioides (Benth.) S.Moore

Redflower ragleaf

312 225 Observations

Asteraceae

Crupina vulgaris Pers. ex Cass.

Bearded creeper

86 47 Observations

Asteraceae

Cyanthillium cinereum (L.) H.Rob.

Little ironweed

743 483 Observations

Asteraceae

Cynara cardunculus L.

Cardoon

6,436 4,941 Observations

Asteraceae

Dahlia imperialis Roezl ex Ortgies

Near Threatened

Bell tree dahlia

272 219 Observations

Asteraceae

Delairea odorata Lem.

German-ivy

713 601 Observations

Asteraceae

Eclipta prostrata (L.) L.

Least Concern

Bhringaraj

1,260 936 Observations

Asteraceae

Elephantopus mollis Kunth

Elephant's foot

231 135 Observations

Asteraceae

Emilia fosbergii Nicolson

Florida tassel-flower

644 487 Observations

Asteraceae

Emilia sonchifolia (L.) DC.

Red tasselflower

378 238 Observations

Asteraceae

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