- Species Common Name Howellia
- Species Scientific Name Howellia aquatilis
- Federal Listing Status Threatened
- State Listing Status Threatened
The Willamette Valley ecoregion is bounded on the west by the Coast Range and on the east by the Cascade Range. This long mostly level alluvial plain has some scattered areas of low basalt, and contrasts with productive farmland and large urban areas. It has the fastest-growing human population in the state resulting in challenges due to land-use changes.