| blessed milkthistle |
Silybum marianum |
4 |
| blue and white daisybush |
Osteospermum ecklonis |
1 |
| bull thistle |
Cirsium vulgare |
2 |
| Canada thistle |
Cirsium arvense |
5 |
| cape ivy |
Delairea odorata |
7 |
| capeweed |
Arctotheca calendula |
2 |
| cardoon |
Cynara cardunculus |
4 |
| cat's ear |
Hypochaeris spp. |
3 |
| common burdock |
Arctium minus |
3 |
| common cocklebur |
Xanthium strumarium |
3 |
| common salsify |
Tragopogon porrifolius |
1 |
| common tarweed |
Centromadia pungens ssp. pungens |
8 |
| cornflower |
Centaurea cyanus |
1 |
| croftonweed |
Ageratina adenophora |
7 |
| goatsbeard |
Tragopogon spp. |
2 |
| great burdock |
Arctium lappa |
1 |
| Italian plumeless thistle |
Carduus pycnocephalus |
1 |
| Malta starthistle |
Centaurea melitensis |
2 |
| musk thistle |
Carduus nutans |
3 |
| prickly lettuce |
Lactuca serriola |
1 |
| rush skeletonweed |
Chondrilla juncea |
2 |
| Russian knapweed |
Rhaponticum repens |
4 |
| Scotch thistle |
Onopordum acanthium |
2 |
| spotted knapweed |
Centaurea stoebe ssp. micranthos |
6 |
| stinking chamomile |
Anthemis cotula |
1 |
| tree marigold |
Tithonia diversifolia |
1 |
| yellow starthistle |
Centaurea solstitialis |
2 |
