| Scientific Name | Common Name | Local Rank |
|---|---|---|
| Apocynum androsaemifolium | bitter dogbane, dogbane | A2 |
| Apocynum cannabinum | dogbane, Indian-hemp | B |
| Asclepias californica | California milkweed | |
| Asclepias cordifolia | purple milkweed | A1 |
| Asclepias speciosa | showy milkweed, milkweed | B |