| Family | Scientific Name | Common Name | Habitat | Distribution | Image |
|---|---|---|---|---|---|
| Melanthiaceae | Amianthium | Fly-poison |  | ||
| Melanthiaceae | Anticlea | Death-camas |  | ||
| Melanthiaceae | Melanthium | Bunchflower |  | ||
| Melanthiaceae | Schoenocaulon | Feathershank |  | ||
| Melanthiaceae | Stenanthium | Featherbells, Featherfleece |  | ||
| Melanthiaceae | Toxicoscordion | Poison Camas |  | ||
| Melanthiaceae | Veratrum | White-hellebore |  | ||
| Melanthiaceae | Zigadenus | Death-camas |  |