Arabis
rockcress
6 species
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Arabis caucasica – mountain rockcress
Distribution: Known only from San Juan County in Washington; Yukon Territory to northwestern Washington.
Habitat: Open, disturbed areas at low elevation, often near where cultivated.
Origin: Introduced
Flowers: May-June
Growth Duration: Perennial
Distribution: Known only from San Juan County in Washington; Yukon Territory to northwestern Washington.
Habitat: Open, disturbed areas at low elevation, often near where cultivated.
Origin: Introduced
Flowers: May-June
Growth Duration: Perennial
Arabis crucisetosa – crosshaired rockcress
Distribution: Occurring in the southeastern corner of Washington; Snake River canyon, Asotin County, Washington, east to west-central Idaho.
Habitat: Wet banks to moist soil or coniferous woods.
Origin: Native
Flowers: April-June
Growth Duration: Perennial
Distribution: Occurring in the southeastern corner of Washington; Snake River canyon, Asotin County, Washington, east to west-central Idaho.
Habitat: Wet banks to moist soil or coniferous woods.
Origin: Native
Flowers: April-June
Growth Duration: Perennial
Arabis eschscholtziana – hairy rockcress, Pacific coast rockcress
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the northern Rocky Mountains.
Habitat: Open areas, often in waste places, from sea level to mid-elevations in the mountains.
Origin: Native
Flowers: April-July
Growth Duration: Annual, Biennial, Perennial
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the northern Rocky Mountains.
Habitat: Open areas, often in waste places, from sea level to mid-elevations in the mountains.
Origin: Native
Flowers: April-July
Growth Duration: Annual, Biennial, Perennial
Arabis furcata – Cascade rockcress, Columbia Gorge rockcress, fork-haired rockcress
Distribution: Occurring on both sides of the Cascades crest in Washington; Washington to Oregon.
Habitat: Open slopes, meadows, and ridgelines in alpine and subalpine areas, and exposed areas in the Columbia River Gorge.
Origin: Native
Flowers: May-July
Growth Duration: Perennial
Distribution: Occurring on both sides of the Cascades crest in Washington; Washington to Oregon.
Habitat: Open slopes, meadows, and ridgelines in alpine and subalpine areas, and exposed areas in the Columbia River Gorge.
Origin: Native
Flowers: May-July
Growth Duration: Perennial
Arabis nuttallii – Nuttall's rockcress
Distribution: Occurring east of the Cascades crest in Washington; eastern British Columbia to eastern Washington, east to Alberta, Montana, Wyoming, and Utah.
Habitat: Moist flats, often sheltered by shrubs, from the foothills to middle elevations in the mountains.
Origin: Native
Flowers: April-August
Growth Duration: Perennial
Distribution: Occurring east of the Cascades crest in Washington; eastern British Columbia to eastern Washington, east to Alberta, Montana, Wyoming, and Utah.
Habitat: Moist flats, often sheltered by shrubs, from the foothills to middle elevations in the mountains.
Origin: Native
Flowers: April-August
Growth Duration: Perennial
Arabis olympica – Olympics rockcress
Distribution: Occurring west of the Cascades crest in Washington, where endemic to the Olympic Mountains.
Habitat: Talus slopes and subalpine meadows.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Distribution: Occurring west of the Cascades crest in Washington, where endemic to the Olympic Mountains.
Habitat: Talus slopes and subalpine meadows.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
