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Subject Scientific Name Images
absinth wormwood Artemisia absinthium 1
African mile-a-minute Mikania cordata 4
alpine knapweed Centaurea nigrescens 1
annual bursage Ambrosia acanthicarpa 3
annual marshelder Iva annua 2
annual sowthistle Sonchus oleraceus 7
Asiatic hawksbeard Youngia japonica 6
aster Aster spp. 1
Bay Biscayne creeping-oxeye Sphagneticola trilobata 1
biennial wormwood Artemisia biennis 1
big sagebrush Artemisia tridentata 3
bitter sneezeweed Helenium amarum 7
black knapweed Centaurea nigra 6
blessed milkthistle Silybum marianum 21
blessed thistle Cnicus benedictus 2
blue and white daisybush Osteospermum ecklonis 1
boneset Eupatorium perfoliatum 8
brassbuttons Cotula coronopifolia 3
bristly hawksbeard Crepis setosa 1
British yellowhead Inula britannica 19
brown knapweed Centaurea jacea 21
bull cottonthistle Onopordum tauricum 11
bull thistle Cirsium vulgare 70
burroweed Isocoma veneta 1
Canada goldenrod Solidago canadensis 5
Canada thistle Cirsium arvense 186
cape ivy Delairea odorata 10
capeweed Arctotheca calendula 6
cardoon Cynara cardunculus 4
cat's ear Hypochaeris spp. 3
chicory Cichorium intybus 37
climbing hempweed Mikania scandens 2
coat buttons Tridax procumbens 6
cocklebur Xanthium spp. 1
coltsfoot Tussilago farfara 88
common burdock Arctium minus 30
common cocklebur Xanthium strumarium 30
common crupina Crupina vulgaris 26
common groundsel Senecio vulgaris 18
common ragweed Ambrosia artemisiifolia 21
common salsify Tragopogon porrifolius 2
common sunflower Helianthus annuus 21
common tansy Tanacetum vulgare 31
common tarweed Centromadia pungens ssp. pungens 8
common yarrow Achillea millefolium 35
corn chamomile Anthemis arvensis 2
cornflower Centaurea cyanus 2
creeping croftonweed Ageratina riparia 2
cressleaf groundsel Packera glabella 3
croftonweed Ageratina adenophora 12
crupina Crupina crupinastrum 3
cup rosinweed Silphium perfoliatum 46
dandelion Taraxacum officinale 50
dandelion Taraxacum spp. 13
devils beggarticks Bidens frondosa 8
diffuse knapweed Centaurea diffusa 18
early goldenrod Solidago juncea 1
eclipta Eclipta prostrata 2
English daisy Bellis perennis 6
fall hawkbit Leontodon autumnalis 1
false chamomile Tripleurospermum perforatum 22
fernleaf yarrow Achillea filipendulina 11
field marigold Calendula arvensis 2
field thistle Cirsium discolor 1
flat-top goldentop Euthamia graminifolia var. graminifolia 3
Florida wild lettuce Lactuca floridana 1
giant ironweed Vernonia gigantea gigantea 18
giant ragweed Ambrosia trifida 24
glandular Cape marigold Dimorphotheca sinuata 2
goatsbeard Tragopogon spp. 8
golden ragwort Packera aurea 1
goldenrod Solidago spp. 13
great burdock Arctium lappa 4
great globethistle Echinops sphaerocephalus 2
hairy beggarticks Bidens pilosa 4
hairy cat's ear Hypochaeris radicata 14
hairy fleabane Conyza bonariensis 1
hairy galinsoga Galinsoga ciliata 13
hairy galinsoga Galinsoga quadriradiata 8
hairy white oldfield aster Symphyotrichum pilosum var. pilosum 8
hawkweeds Hieracium spp. 22
hempvine Mikania spp. 1
horse thistle Onopordum acaulon 2
horseweed Conyza canadensis 39
Illyrian cottonthistle Onopordum illyricum 2
Italian hawksbeard Crepis bursifolia 2
Italian plumeless thistle Carduus pycnocephalus 4
Jerusalem artichoke Helianthus tuberosus 25
joe pye weed Eupatoriadelphus spp. 4
knapweeds Centaurea spp. 8
lawn burweed Soliva sessilis 3
Madagascar ragwort Senecio madagascariensis 1
Malta starthistle Centaurea melitensis 6
meadow hawkweed Hieracium caespitosum 21
meadow knapweed Centaurea moncktonii 1
meadow salsify Tragopogon lamottei 5
Mexican brassbuttons Cotula mexicana 1
mile-a-minute Mikania micrantha 4
moist sowthistle Sonchus arvensis ssp. uliginosus 1
mugwort Artemisia vulgaris 17
musk thistle Carduus nutans 115
narrowleaf hawksbeard Crepis tectorum 3
North African knapweed Centaurea diluta 1
orange hawkweed Hieracium aurantiacum 29
oxeye daisy Leucanthemum vulgare 40
parasol whitetop Doellingeria umbellata var. umbellata 3
perennial sowthistle Sonchus arvensis 45
pineapple-weed Matricaria discoidea 12
prickly lettuce Lactuca serriola 58
purple starthistle Centaurea calcitrapa 16
rosering gaillardia Gaillardia pulchella 1
rush skeletonweed Chondrilla juncea 15
Russian knapweed Rhaponticum repens 28
safflower Carthamus tinctorius 1
Scotch thistle Onopordum acanthium 50
seepwillow Baccharis salicifolia 1
shrine jimmyweed Isocoma tenuisecta 1
skeletonleaf bursage Ambrosia tomentosa 1
slenderflower thistle Carduus tenuiflorus 2
smallflower galinsoga Galinsoga parviflora 1
smooth hawksbeard Crepis capillaris 4
South African ragwort Senecio inaequidens 3
southern brassbuttons Cotula australis 3
spiny cocklebur Xanthium spinosum 1
spiny plumeless thistle Carduus acanthoides 16
spiny sowthistle Sonchus asper 18
spotted joe pye weed Eupatoriadelphus maculatus 2
spotted knapweed Centaurea stoebe 128
spotted knapweed Centaurea stoebe ssp. micranthos 83
squarrose knapweed Centaurea virgata 18
stinking chamomile Anthemis cotula 11
sulphur knapweed Centaurea sulphurea 1
tall ironweed Vernonia gigantea 16
tall lettuce Lactuca canadensis 8
tansy ragwort Senecio jacobaea 108
thistle Cirsium spp. 7
tree marigold Tithonia diversifolia 1
wall lettuce Mycelis muralis 70
wavyleaf thistle Cirsium undulatum 2
western salsify Tragopogon dubius 30
white heath aster Symphyotrichum ericoides var. ericoides 11
white snakeroot Ageratina altissima 1
white snakeroot Ageratina altissima var. altissima 1
wild safflower Carthamus oxyacanthus 4
woolly distaff thistle Carthamus lanatus 2
woollyleaf bursage Ambrosia grayi 1
yellow chamomile Anthemis tinctoria 2
yellow hawkweed Hieracium fendleri 3
yellow starthistle Centaurea solstitialis 66
yellowspine thistle Cirsium ochrocentrum 3

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