| Ambrosia artemesiifolia | Roman Wormwood, Bitterweed, Blackweed, Carrot Weed, Hay Fever Weed, Stickeweed, Tassel Weed, Wild Ta | Annual | 0.9 |
4-8
| M | LMH | SN | M | 2 | 3 | 1 |
| Ambrosia trifida | Giant Ragweed, Great ragweed, Texan great ragweed, Bitterweed, Bloodweed, Buffalo Weed, Horse Cane | Annual | 2.0 |
1-11
| M | LMH | SN | M | 1 | 3 | 1 |