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

106 62 Observations

Asteraceae

Acanthospermum hispidum DC.

Bristly starbur

133 89 Observations

Asteraceae

Achillea millefolium L.

Least Concern

Common yarrow

26,045 21,639 Observations

Asteraceae

Acmella uliginosa (Sw.) Cass.

Least Concern

Marsh para cress

68 37 Observations

Asteraceae

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

Crofton weed

688 519 Observations

Asteraceae

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

Mistflower

549 270 Observations

Asteraceae

Ageratum conyzoides L.

Billy goat weed

638 479 Observations

Asteraceae

Ageratum houstonianum Mill.

Bluemink

3,496 2,965 Observations

Asteraceae

Ambrosia artemisiifolia L.

Annual ragweed

5,474 4,360 Observations

Asteraceae

Ambrosia psilostachya DC.

Dunbible-weed

417 301 Observations

Asteraceae

Ambrosia trifida L.

Giant Ragweed

1,122 932 Observations

Asteraceae

Anthemis cotula L.

Chamomile

1,719 1,358 Observations

Asteraceae

Arctotheca calendula (L.) Levyns

Capeweed

1,687 1,311 Observations

Asteraceae

Artemisia biennis Willd.

Biennial wormwood

158 93 Observations

Asteraceae

Baccharis halimifolia L.

Least Concern

Eastern baccharis

1,671 1,201 Observations

Asteraceae

Baccharis pilularis DC.

Coyote brush

725 658 Observations

Asteraceae

Bidens alba (L.) DC.

Romerillo

286 201 Observations

Asteraceae

Bidens frondosa L.

Least Concern

Devil's Beggarticks

3,153 2,290 Observations

Asteraceae

Bidens pilosa L.

Spanish-needles

3,032 2,225 Observations

Asteraceae

Carduus nutans L.

Musk thistle

5,079 3,637 Observations

Asteraceae

Carduus pycnocephalus L.

Italian thistle

4,605 3,274 Observations

Asteraceae

Centaurea debeauxii Godr. & Gren.

Meadow knapweed

13 6 Observations

Asteraceae

Centaurea diffusa Lam.

Diffuse knapweed

239 163 Observations

Asteraceae

Centaurea iberica Trevir. ex Spreng.

Iberian knapweed

67 44 Observations

Asteraceae

Centaurea macrocephala Muss.Puschk. ex Willd.

Giant knapweed

551 435 Observations

Asteraceae

Centaurea melitensis L.

Maltese starthistle

831 586 Observations

Asteraceae

Centaurea solstitialis L.

Yellow starthistle

1,378 999 Observations

Asteraceae

Centaurea stoebe Tausch

Spotted knapweed

80 53 Observations

Asteraceae

Centratherum punctatum Cass.

Lark daisy

549 427 Observations

Asteraceae

Chondrilla juncea L.

Rush skeletonweed

2,137 1,383 Observations

Asteraceae

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

Hagonoy

945 664 Observations

Asteraceae

Chrysanthemoides monilifera (L.) Norl.

Least Concern

Boneseed

80 50 Observations

Asteraceae

Cichorium endivia L.

Endive Chicory

11,508 9,619 Observations

Asteraceae

Cirsium arvense (L.) Scop.

Field thistle

17,666 13,084 Observations

Asteraceae

Cirsium mexicanum DC.

Mexican thistle

33 15 Observations

Asteraceae

Cirsium vulgare (Savi) Ten.

Spear Thistle

21,945 16,502 Observations

Asteraceae

Conyza bonariensis (L.) Cronquist

Asthmaweed

515 345 Observations

Asteraceae

Conyza canadensis (L.) Cronquist

Canadian horseweed

4,045 3,053 Observations

Asteraceae

Cosmos caudatus Kunth

Cosmos

1,133 957 Observations

Asteraceae

Cosmos sulphureus Cav.

Orange cosmos

4,314 3,613 Observations

Asteraceae

Crassocephalum crepidioides (Benth.) S.Moore

Redflower ragleaf

349 248 Observations

Asteraceae

Crupina vulgaris Pers. ex Cass.

Bearded creeper

96 55 Observations

Asteraceae

Cyanthillium cinereum (L.) H.Rob.

Little ironweed

785 514 Observations

Asteraceae

Cynara cardunculus L.

Cardoon

7,302 5,594 Observations

Asteraceae

Dahlia imperialis Roezl ex Ortgies

Near Threatened

Bell tree dahlia

301 243 Observations

Asteraceae

Delairea odorata Lem.

German-ivy

737 622 Observations

Asteraceae

Eclipta prostrata (L.) L.

Least Concern

Bhringaraj

1,344 1,004 Observations

Asteraceae

Elephantopus mollis Kunth

Elephant's foot

265 151 Observations

Asteraceae

Emilia fosbergii Nicolson

Florida tassel-flower

684 523 Observations

Asteraceae

Emilia sonchifolia (L.) DC.

Red tasselflower

434 265 Observations

Asteraceae

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