Allium douglasii, the Douglas' onion, is a perennial herbaceous flowering plant in the Amaryllidaceae family. It is native to northeastern Oregon, eastern Washington, and northern Idaho.
Allium douglasii is a perennial herbaceous flowering plant that produces egg-shaped bulbs up to long. Scapes are round in cross-section, up to tall. Flowers are up to across; tepals pink or purple with green midribs; anthers blue; pollen white or light gray. Two grooved leaves usually remain during the flowering stage.
Allium douglasii is endemic to sections of the Northwestern United States (northeastern Oregon, Idaho, eastern Washington). It typically grows in shallow soils at elevations of above sea level.
, the conservation group NatureServe listed Allium douglasii as Apparently Secure (G4) worldwide. This status was last reviewed on 7 August 1984. At the state level, this species is listed as No Status Rank (not assessed) in Idaho and Oregon, and as Secure (G5) in Washington.
Allium douglasii was first named and described by William Jackson Hooker in 1838 in the Flora Boreali-Americana publication
The specific epithet, douglasii, is named in honour of scottish botanist David Douglas. In English, this species is commonly known as Douglas' Onion.