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Subject Scientific Name Images
African mile-a-minute Mikania cordata 2
alpine knapweed Centaurea nigrescens 2
annual bursage Ambrosia acanthicarpa 1
annual fleabane Erigeron annuus 1
annual marshelder Iva annua 2
annual sowthistle Sonchus oleraceus 1
annual wormwood Artemisia annua 1
biennial wormwood Artemisia biennis 2
black knapweed Centaurea nigra 2
blue lettuce Lactuca tatarica var. pulchella 1
bristly hawksbeard Crepis setosa 2
British yellowhead Inula britannica 9
brown knapweed Centaurea jacea 3
bull cottonthistle Onopordum tauricum 3
bull thistle Cirsium vulgare 10
bur beggarticks Bidens tripartita 1
Canada goldenrod Solidago canadensis 2
Canada thistle Cirsium arvense 14
capeweed Arctotheca calendula 9
chicory Cichorium intybus 5
coat buttons Tridax procumbens 2
coltsfoot Tussilago farfara 10
common burdock Arctium minus 2
common cocklebur Xanthium strumarium 3
common crupina Crupina vulgaris 2
common groundsel Senecio vulgaris 3
common ragweed Ambrosia artemisiifolia 3
common sunflower Helianthus annuus 4
common yarrow Achillea millefolium 6
corn chamomile Anthemis arvensis 1
cornflower Centaurea cyanus 3
Coulter's horseweed Laennecia coulteri 2
cressleaf groundsel Packera glabella 3
croftonweed Ageratina adenophora 3
crupina Crupina crupinastrum 1
cup rosinweed Silphium perfoliatum 6
dandelion Taraxacum officinale 7
devils beggarticks Bidens frondosa 4
diffuse knapweed Centaurea diffusa 2
false chamomile Tripleurospermum perforatum 2
giant ragweed Ambrosia trifida 2
hairy beggarticks Bidens pilosa 1
hairy fleabane Conyza bonariensis 3
hairy galinsoga Galinsoga ciliata 3
hairy galinsoga Galinsoga quadriradiata 2
horse thistle Onopordum acaulon 4
horseweed Conyza canadensis 9
Illyrian cottonthistle Onopordum illyricum 3
Italian plumeless thistle Carduus pycnocephalus 2
Jerusalem artichoke Helianthus tuberosus 3
Madagascar ragwort Senecio madagascariensis 5
mile-a-minute Mikania micrantha 2
mugwort Artemisia vulgaris 2
musk thistle Carduus nutans 11
North African knapweed Centaurea diluta 1
perennial sowthistle Sonchus arvensis 3
pineapple-weed Matricaria discoidea 4
prickly lettuce Lactuca serriola 3
rush skeletonweed Chondrilla juncea 3
Russian knapweed Rhaponticum repens 1
safflower Carthamus tinctorius 1
Scotch thistle Onopordum acanthium 8
seepwillow Baccharis salicifolia 2
slenderflower thistle Carduus tenuiflorus 2
South African ragwort Senecio inaequidens 5
spiny plumeless thistle Carduus acanthoides 4
spiny sowthistle Sonchus asper 3
spotted knapweed Centaurea stoebe 3
spotted knapweed Centaurea stoebe ssp. micranthos 17
squarrose knapweed Centaurea virgata 2
stinking chamomile Anthemis cotula 2
sulphur knapweed Centaurea sulphurea 2
tall fleabane Conyza floribunda 2
tall ironweed Vernonia gigantea 5
tansy ragwort Senecio jacobaea 6
thistle Cirsium spp. 2
wavyleaf thistle Cirsium undulatum 1
western ragweed Ambrosia psilostachya 1
western salsify Tragopogon dubius 2
wild safflower Carthamus oxyacanthus 2
willowleaf lettuce Lactuca saligna 2
woolly distaff thistle Carthamus lanatus 2
yellow chamomile Anthemis tinctoria 1
yellowspine thistle Cirsium ochrocentrum 1

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