| Asteraceae |
|
Conyza canadensis
| (L.) Cronquist | Bull. Torrey Bot. Club 70(6): 632 | 1943 |
| Asteraceae |
|
Conyza canadensis var. canadensis
| | | |
| Asteraceae |
|
Conyza canadensis var. glabrata
| (A. Gray) Cronquist | Bull. Torrey Bot. Club 74(2): 150 | 1947 |
| Asteraceae |
|
Conyza canadensis var. pusilla
| (Nutt.) Cronquist | Bull. Torrey Bot. Club 74(2): 150 | 1947 |