Iris Family
5 genera
17 species
9 subspecies and varieties
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Scientific name
Common name
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Crocosmia ×crocosmiifloramontbretia
Origin: Introduced from South Africa
Crocus ×stellarisyellow crocus
Origin: Introduced (garden origin)
Crocus tommasinianusearly crocus
Origin: Introduced from southeast Europe
Crocus vernus
Origin: Introduced
ssp. vernus – spring crocus
Iris foetidissimastinking iris
Origin: Introduced from Europe
Iris germanicabearded iris, German iris
Origin: Introduced from southern Europe
Iris missouriensiswestern blue flag, Rocky Mountain iris
Distribution: Occurring chiefly east of the Cascades crest in Wahington, but also known from the Puget Sound area; British Columbia to California, east to the Rocky Mountains.
Habitat: Common in vernally moist meadows, especially in sagebrush and Ponderosa pine forests.
Origin: Native
Flowers: May-July
Iris pseudacoruspale yellow iris
Distribution: Occurring on both sides of the Cascades crest in Washington, but more common west of the crest; British Columbia to California, east to Idaho and Montana; also in eastern North America.
Habitat: Wetlands, lake and pond margins, irrigation ditches, backwaters, and other wet places where often disturbed; invasive.
Origin: Introduced from Eurasia
Flowers: May-July
Iris sibiricaSiberian iris
Origin: Introduced
Iris tenaxOregon flag, tough-leaf iris
Distribution: Occurring west of the Cascades crest in Washington; Washington to California.
Habitat: Prairies, meadows, open oak and coniferous forests, at low to middle elevations.
Origin: Native
Flowers: April-June
var. tenax – Oregon flag, tough-leaf iris
Olsynium douglasiipurple-eyed grass, grass-widow
Distribution: Widely distributed throughout Washington, but more common east of the Cascades crest; British Columbia to California, east to Idaho, Nevada, and Utah.
Habitat: Coastal bluffs, prairies, open rocky areas, oak and ponderosa pine woodlands, sagebrush and juniper desert, where moist in early spring.
Origin: Native
Flowers: March-June
var. douglasii – purple-eyed grass, grass-widow
var. inflatum – purple-eyed grass, grass-widow
Sisyrinchium californicumgolden-eyed grass
Distribution: Chiefly west of the Cascades in Washington; southern Vancouver Island, B.C, south to southern California.
Habitat: Wet ground, especially at the edges of lakes and bogs, at low to moderate elevations.
Origin: Native
Flowers: June-July
Sisyrinchium idahoenseIdaho blue-eyed grass
Distribution: Widely distributed across Washington; British Columbia to California, east to Montana and New Mexico.
Habitat: Vernally wet areas and marshes, near sea level to mid-elevations in the mountains.
Origin: Native
Flowers: April-July
var. idahoense – Idaho blue-eyed grass
var. macounii – Macoun's blue-eyed grass
var. occidentale – western blue-eyed grass
var. segetum – cornfield blue-eyed grass, prairie grass
Sisyrinchium littoraleAlaska blue-eyed grass, shore grass
Distribution: Occurring west of the Cascades crest in coastal areas in Washington; Alaska to Oregon
Habitat: Coastal moist, sandy or grassy areas, interdunal depressions, edges of streams and lakes
Origin: Native
Flowers: May-July
Sisyrinchium montanumstrict blue-eyed grass
Distribution: Occurring east of the Cascades crest in north-central Washington; Yukon Territory to Washington, east to the Rocky Mountains, northern Great Plains, Great Lakes region, and northeastern North America.
Habitat: Moist meadows, stream banks, and for openings at low to middle elevations.
Origin: Native
Flowers: May-July
Sisyrinchium sarmentosumpale grass, Suksdorf's blue-eyed grass
Distribution: In the Cascade Mountains of Washington and Oregon near the Columbia River Gorge.
Habitat: Moist, grassy areas.
Origin: Native
Flowers: June-August
Sisyrinchium septentrionalenorthern blue-eyed grass
Distribution: Occurring in northeastern Washington; British Columbia east to Saskatchewan, south into northern Washington.
Habitat: Mesic to dry meadows and stream banks.
Origin: Native
Flowers: June-July