[Onions: The Genus Allium East of the Cascade Mountains of Oregon and Washington]

Douglas' Onion

Allium douglasii

Synonym: Allium douglasii var. douglasii

Close-up of the flower of Douglas' Onion: Allium douglasii (Synonym: Allium douglasii var. douglasii)

A close-up of the flower of Douglas' onion as seen on drying slopes on Cabbage Hill (old highway) to the east of Pendleton, OR..........June 25, 2008.

Characteristics:

Douglas' onion is an attractive wildflower with 2 basal leaves and a single leafless scape giving rise to a cluster of flowers at its tip. The stem is usually held higher than the leaves. The leaves are either convex in cross section and 2-8 mm wide or strongly flattened and up to 15 mm wide. The leaves usually persist until flowering. The scape is usually 20-30 cm high.

Two or three broadly ovate bracts with short-pointed tips subtend the umbel. The bracts are 5-7 nerved. The umbel is several to many-flowered with individual flowers on thin pedicels which are 2-3 times longer than the tepals. The 6 tepals range from 6-10 mm long and are narrowly lanceolate with pointed tips. The coloration is pink or rarely white. The midribs of the tepals are prominent. The stamens are as long as or longer than the perianth with oblong, obtuse, or acute anthers.


Former Varieties of Allium douglasii:

variety columbianum: Leaves narrow, channeled and often not curved. Scape thickened below the umbel but not constricted. Plants along the Washington & Idaho state line from Kootenai to Idaho Counties Idaho through Spokane County, Washington to northern Whitman County in southeastern Washington. Also found in Sander County, Montana.

varitey constrictum: Leaves narrow, channeled and often not curved. Scape thickened below the umbel but constricted between the umbel and the swollen upper part of the scape. Plants of Upper Grand Coulee, Grant County, WA.

variety douglasii: Leaves wide and flat, often curved. Scape not thickened below the umbel. Plants found from southern Whitman and central Walla Walla Counties in southeastern Washington south to Wheeler, Grant and eastern Umatilla Counties in Oregon.

variety nevii: Leaves narrow, channeled and often not curved. Scape not thickened below the umbel. Plants of the eastern slope of the Cascade Mts. from Kittitas County in Washington south to northern Oregon.


Habitat:

Douglas' onion is a plant of grasslands, sagebrush desert, and ponderosa pine forests in shallow, winter wet soils.


Range:

Douglas' onion is found wholly east of the Cascade Mountains, from Kittitas County, WA east to Spokane County and south to northern and northeastern Oregon.


Flowers of Allium douglasii - Allium douglasii

These 2 photos show Douglas' onion as seen on drying slopes on Cabbage Hill (old highway) to the east of Pendleton, OR..........June 25, 2008.

Douglas' Onion: Allium douglasii (Synonym: Allium douglasii var. douglasii) - Inflorescence of Douglas' Onion: Allium douglasii (Synonym: Allium douglasii var. douglasii)

Close-ups of douglas' onion as seen in vernally moist, muddy soils along Reecer Creek Road in the Wenatchee National Forest........June 5, 2009.

Flower of Douglas' Onion: Allium douglasii (Synonym: Allium douglasii var. douglasii) - Inflorescence of Douglas' Onion: Allium douglasii (Synonym: Allium douglasii var. douglasii)

The photos above show close-ups of the flowers of douglas' onion as seen south of Condon, OR along Carter Hill Road immediately west of its junction with Ramsey Canyon Road...........May 28, 2007.

Inflorescence of Allium douglasii

A close-up of the umbel of Douglas' onion (old variety douglasii) as seen atop Cabbage Hill east of Pendleton, OR......May 30, 1999.

Paul Slichter