Draft Recovery Plan for Howell's Spectacular Thelypody ('Thelypodium howellii ssp. spectabilis').

摘要

Howell's spectacular thelypody (Theylpodium howellii ssp. Spectability)(thelypody) was listed as a threatened species on June 25, 1999 (64 FR 28393). This taxon is endemic to the Baker-Powder River Valley in eastern Oregon. It is currently found in five populations in Baker and Union Counties, Oregon. It formerly also occurred in the Willow Creek Valley in Malheur County. Howell's spectacular thelypody is a herbaceous biennial that occurs in mesic, alkaline habitats in the Baker-Powder River Valley region in northeast Oregon. Sites range from approximately 1,000 meters (3,000 feet) to 1,100 meters (3,500 feet) in elevation. Thelypody is threatened by a variety of factors including habitat destruction and fragmentation from agricultural and urban development, grazing by domestic livestock, competition from non-native vegetation, and alterations of wetland hydrology.