Allium constrictum, the Grand Coulee Onion, is a plant species endemic to the US State of Washington. It is known from only three counties in the east-central part of the state: Douglas, Grant, and Lincoln. It grows on dry, sandy soils at elevations of 300–500 m.[1]

Grand Coulee Onion
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Monocots
Order:	Asparagales
Family:	Amaryllidaceae
Subfamily:	Allioideae
Genus:	Allium
Species:	A. constrictum
Binomial name
Allium constrictum (F.M.Ownbey & L.V.Mingrone) M. E. Jones ex Ownbey
Synonyms
Allium douglasii var. constrictum F.M.Ownbey & L.V.Mingrone

Allium constrictum produces egg-shaped bulbs up to 8 mm long. Flowers are up to 10 mm across, pink to rose with green midrib; anthers and pollen blue to gray [1][2][3][4]

References