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Subject Scientific Name Images
absinth wormwood Artemisia absinthium 2
African mile-a-minute Mikania cordata 5
alpine knapweed Centaurea nigrescens 3
annual bursage Ambrosia acanthicarpa 4
annual fleabane Erigeron annuus 1
annual marshelder Iva annua 2
annual sowthistle Sonchus oleraceus 18
annual wormwood Artemisia annua 1
Asiatic hawksbeard Youngia japonica 6
aster Aster spp. 2
Aster 2
Bay Biscayne creeping-oxeye Sphagneticola trilobata 2
biennial wormwood Artemisia biennis 3
big sagebrush Artemisia tridentata 3
bitter sneezeweed Helenium amarum 7
black knapweed Centaurea nigra 8
blessed milkthistle Silybum marianum 26
blessed thistle Cnicus benedictus 2
blue and white daisybush Osteospermum ecklonis 1
blue lettuce Lactuca tatarica var. pulchella 1
boneset Eupatorium perfoliatum 14
brassbuttons Cotula coronopifolia 3
bristly hawksbeard Crepis setosa 3
British yellowhead Inula britannica 33
brown knapweed Centaurea jacea 23
bull cottonthistle Onopordum tauricum 19
bull thistle Cirsium vulgare 123
bur beggarticks Bidens tripartita 1
burroweed Isocoma veneta 1
Canada goldenrod Solidago canadensis 9
Canada thistle Cirsium arvense 228
cape ivy Delairea odorata 14
capeweed Arctotheca calendula 14
cardoon Cynara cardunculus 4
cat's ear Hypochaeris spp. 3
chicory Cichorium intybus 51
climbing hempweed Mikania scandens 2
coat buttons Tridax procumbens 7
cocklebur Xanthium spp. 1
coltsfoot Tussilago farfara 103
common burdock Arctium minus 44
common cocklebur Xanthium strumarium 38
common crupina Crupina vulgaris 29
common groundsel Senecio vulgaris 23
common ragweed Ambrosia artemisiifolia 27
common salsify Tragopogon porrifolius 2
common sunflower Helianthus annuus 21
common tansy Tanacetum vulgare 40
common tarweed Centromadia pungens ssp. pungens 12
common yarrow Achillea millefolium 53
corn chamomile Anthemis arvensis 3
cornflower Centaurea cyanus 6
Coulter's horseweed Laennecia coulteri 2
creeping croftonweed Ageratina riparia 3
cressleaf groundsel Packera glabella 3
croftonweed Ageratina adenophora 19
crupina Crupina crupinastrum 3
cup rosinweed Silphium perfoliatum 52
dandelion Taraxacum officinale 58
dandelion Taraxacum spp. 14
devils beggarticks Bidens frondosa 9
diffuse knapweed Centaurea diffusa 22
early goldenrod Solidago juncea 4
eclipta Eclipta prostrata 3
English daisy Bellis perennis 6
fall hawkbit Leontodon autumnalis 1
false chamomile Tripleurospermum perforatum 22
fernleaf yarrow Achillea filipendulina 12
field marigold Calendula arvensis 2
field thistle Cirsium discolor 5
flat-top goldentop Euthamia graminifolia var. graminifolia 7
fleabanes Erigeron spp. 1
Florida wild lettuce Lactuca floridana 2
giant ironweed Vernonia gigantea gigantea 25
giant ragweed Ambrosia trifida 33
glandular Cape marigold Dimorphotheca sinuata 2
goatsbeard Tragopogon spp. 12
golden ragwort Packera aurea 1
goldenrod Solidago spp. 20
great burdock Arctium lappa 6
great globethistle Echinops sphaerocephalus 3
hairy beggarticks Bidens pilosa 5
hairy cat's ear Hypochaeris radicata 26
hairy fleabane Conyza bonariensis 4
hairy galinsoga Galinsoga ciliata 15
hairy galinsoga Galinsoga quadriradiata 8
hairy white oldfield aster Symphyotrichum pilosum var. pilosum 14
hawkweeds Hieracium spp. 24
hempvine Mikania spp. 1
horse thistle Onopordum acaulon 4
horseweed Conyza canadensis 48
horseweeds Conyza spp. 1
Illyrian cottonthistle Onopordum illyricum 3
Italian hawksbeard Crepis bursifolia 2
Italian plumeless thistle Carduus pycnocephalus 11
Jerusalem artichoke Helianthus tuberosus 31
joe pye weed Eupatoriadelphus spp. 15
knapweeds Centaurea spp. 9
lawn burweed Soliva sessilis 3
Madagascar ragwort Senecio madagascariensis 5
Malta starthistle Centaurea melitensis 6
meadow hawkweed Hieracium caespitosum 25
meadow knapweed Centaurea moncktonii 8
meadow salsify Tragopogon lamottei 5
Mexican brassbuttons Cotula mexicana 1
mile-a-minute Mikania micrantha 4
moist sowthistle Sonchus arvensis ssp. uliginosus 1
mouseear hawkweed Hieracium pilosella 2
mugwort Artemisia vulgaris 26
musk thistle Carduus nutans 160
narrowleaf hawksbeard Crepis tectorum 6
North African knapweed Centaurea diluta 2
orange hawkweed Hieracium aurantiacum 41
oxeye daisy Leucanthemum vulgare 54
parasol whitetop Doellingeria umbellata var. umbellata 3
perennial sowthistle Sonchus arvensis 61
pineapple-weed Matricaria discoidea 16
prickly lettuce Lactuca serriola 88
purple starthistle Centaurea calcitrapa 17
rosering gaillardia Gaillardia pulchella 1
rush skeletonweed Chondrilla juncea 21
Russian knapweed Rhaponticum repens 38
safflower Carthamus tinctorius 2
Scotch thistle Onopordum acanthium 69
seepwillow Baccharis salicifolia 2
Senegal tea plant Gymnocoronis spilanthoides 3
shrine jimmyweed Isocoma tenuisecta 1
skeletonleaf bursage Ambrosia tomentosa 2
slenderflower thistle Carduus tenuiflorus 4
smallflower galinsoga Galinsoga parviflora 1
smooth hawksbeard Crepis capillaris 4
South African ragwort Senecio inaequidens 5
southern brassbuttons Cotula australis 3
spiny cocklebur Xanthium spinosum 3
spiny plumeless thistle Carduus acanthoides 22
spiny sowthistle Sonchus asper 25
spotted joe pye weed Eupatoriadelphus maculatus 5
spotted knapweed Centaurea stoebe 144
spotted knapweed Centaurea stoebe ssp. micranthos 125
squarrose knapweed Centaurea virgata 24
stinking chamomile Anthemis cotula 15
sulphur knapweed Centaurea sulphurea 3
tall fleabane Conyza floribunda 2
tall ironweed Vernonia gigantea 18
tall lettuce Lactuca canadensis 9
tansy ragwort Senecio jacobaea 129
thistle Cirsium spp. 10
tree marigold Tithonia diversifolia 1
wall lettuce Mycelis muralis 86
wavyleaf thistle Cirsium undulatum 3
western ragweed Ambrosia psilostachya 1
western salsify Tragopogon dubius 37
white heath aster Symphyotrichum ericoides var. ericoides 16
white snakeroot Ageratina altissima 3
white snakeroot Ageratina altissima var. altissima 4
wild safflower Carthamus oxyacanthus 4
willowleaf lettuce Lactuca saligna 2
woolly distaff thistle Carthamus lanatus 4
woollyleaf bursage Ambrosia grayi 1
yellow chamomile Anthemis tinctoria 3
yellow hawkweed Hieracium fendleri 3
yellow starthistle Centaurea solstitialis 119
yellow thistle Cirsium horridulum 1
yellowspine thistle Cirsium ochrocentrum 4

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