| Asteraceae | |
Ambrosia psilostachya var. californica
| (Rydb.) S.F. Blake | Contr. U.S. Natl. Herb. 25: 581 | 1925 |
| Asteraceae | |
Ambrosia psilostachya var. coronopifolia
| (Torr. & A. Gray) Farw. | Manual (ed. 8) 1470 | 1950 |
| Asteraceae | |
Ambrosia psilostachya var. lindheimeriana
| (Scheele) Blank. | Rep. (Annual) Missouri Bot. Gard. 18: 173 | 1907 |
| Asteraceae | |
Ambrosia psilostachya var. psilostachya
| | | |