Willamette Valley native prairies are important habitats for several plant species listed under federal and state endangered species acts.
| Scientific name | Common name | Status | |
| Federal | State | ||
| Aster curtus | White-topped aster | — | T |
| Castilleja levisecta | Golden paintbrush | T | E |
| Delphinium leucophaeum | White rock larkspur | — | E |
| Delphinium oreganum | Willamette Valley larkspur | — | C |
| Delphinium pavonaeceum | Peacock larkspur | — | E |
| Erigeron decumbens var. decumbens | Willamette daisy | E | E |
| Horkelia congesta spp. congesta | Shaggy horkelia | — | C |
| Lomatium bradshawii | Bradshaw’s lomatium | E | E |
| Lupinus sulphureus ssp. kincaidii | Kincaid’s lupine | T | T |
| Meconella oregana | White meconella | — | C |
| Montia howellii | Howell’s montia | — | C |
| Sidalcea campestris | Meadow sidalcea | — | C |
| Sidalcea nelsoniana | Nelson’s checkermallow | T | T |
Notes: Federal status refers to listings by the US Fish and Wildlife Service. State status refers to listings by the Oregon Department of Agriculture Plant Conservation Biology Program.
E = Listed as endangered
T = Listed as threatened
C = Candidate for listing
Sources:
Oregon Natural Heritage Program (2001)
Rare, threatened and endangered plants and animals of Oregon, Oregon Natural Heritage Program, Portland, Oregon. U.S. Fish and Wildlife Service (1997)
Determination of threatened status of Castilleja levisecta (golden paintbrush), Federal Register, June 11, 1997. U. S. Fish and Wildlife Service (2000)
Endangered status for Erigeron decumbens var. decumbens (Willamette Daisy) and Fender’s Blue Butterfly (Icaricia icarioides fenderi) and threatened status for Lupinus sulphureus ssp. kincaidii (Kincaid’s Lupine), Federal Register, Washington DC, January 25, 2000 (Volume 65, Number 16).