Page authors: Don Knoke, David Giblin
Allium constrictum
Grand Coulee onion

Distribution: Occurring east of the Cascades crest in Grant and Douglas counties in Washington.

Habitat: Shallow, vernally-moist soils in low, open areas.

Flowers: May-July

Origin: Native

Conservation Status: Sensitive in Washington (WANHP)


Scapose perennial from one or more ovoid bulbs, the inner coats reddish to white, the outer coats gray to brown; with a thin inner membrane showing a distinct network pattern.


Leaves 2, narrow, concave-convex, persisting at maturity, shorter than the scape; scape strongly thickened below the umbel, with a definite constriction between the swollen apex of the scape and the umbel; scape usually 2-3 dm. tall, terete.


Umbel several- to many-flowered, the slender pedicels 2-3 times the length of the tepals; tepals usually 7-8 mm. long, entire, pointed, narrowly lanceolate, usually pink; stamens 6, about as long as the tepals.


Capsule 3-celled.

Accepted Name:
Allium constrictum (Ownbey & Mingrone) P. M. Peterson, Annable & Rieseberg
Publication: Syst. Bot. 13: 211. 1988.

Synonyms & Misapplications:
Allium douglasii Hook. var. constrictum Ownbey & Mingrone [HC]
Additional Resources:

PNW Herbaria: Specimen records of Allium constrictum in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Allium constrictum checklist entry.

E-Flora BC: Allium constrictum atlas page.

CalPhotos: Allium constrictum photos.

USDA Plants: Allium constrictum information.

17 photographs:
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