Howell’s Spectacular Thelypody

Photo Credit: Oregon Department of Agriculture


  • Species Common Name Howell's Spectacular Thelypody
  • Species Scientific Name Thelypodium howellii ssp. spectabilis
  • Federal Listing Status Threatened
  • State Listing Status Endangered


Special needs

Howell's spectacular thelypody occurs in low-elevation (3000-3500 feet) river valleys and moist, alkaline plains. This species is often found at the intersection of black greasewood and riparian habitat. Howell's spectacular thelypody may be dependent on seasonal flooding.

Limiting factors

This narrowly-distributed species is endemic to the Baker-Powder drainage. Much of this species' habitat has been converted to agricultural uses. Competition from invasive plants, changes in hydrology, grazing pressure, and mowing during the growing season have also adversely affected Howell's spectacular thelypody.

Conservation actions

Locate protected sites in potential habitat. Create new populations. Minimize grazing and mowing during the growing season at priority locations. Control key invasive plants. Continue voluntary cooperative efforts with private landowners. Collect and store seeds.

Key reference or plan

Oregon Department of Agriculture Plant Conservation