| Allenrolfea occidentalis | Picklebush | Amaranthaceae | Homotypic Synonyms: Halostachys occidentalis S.Watson. Salicornia occidentalis (S.Watson) Greene. Spirostachys occidentalis (S.Watson) S.Watson. Heterotypic Synonyms: Allenrolfea mexicana Lundell. Arthrocnemum fruticosum Torr. Arthrocnemum fruticosum var. californicum Moq. Arthrocnemum macrostachyum Torr. Salicornia californica Nutt. ex Moq. | 3 | 0 |
| Alternanthera sissoo | Brazilian Spinach, Sambu, Samba lettuce | Amaranthaceae | Alternanthera sessilis | 4 | 0 |
| Amaranthus acanthochiton | Greenstripe Amaranth | Amaranthaceae | Homotypic Synonyms: Acanthochiton wrightii Torr. | 2 | 0 |