Page author: David Giblin
Erysimum occidentale
pale wallflower, western wallflower

Distribution: Occurring east of the Cascades crest in Washington; northern Washington to eastern Oregon.

Habitat: Sagebrush hills and valleys.

Flowers: March-May

Origin: Native

Growth Duration: Biennial, Perennial

Conservation Status: Not of concern

Pollination: Bees, butterflies, flies, hummingbirds


Grayish biennial from a simple crown, the simple, single stem 2-4.5 dm. tall.


Basal leaves many, rosette-forming, linear-oblanceolate, 4-8 cm. long and 2-4 mm. broad, mostly entire; cauline leaves many, linear to linear-lanceolate, 1-3 mm. broad, not much reduced upward, usually entire.


Flowers rather showy, in crowded, bractless racemes; pedicles stout, ascending; sepals 4, 8-10 mm. long, the outer 2 saccate at the base; petals 4, bright yellow, the claw slightly exceeding the sepals, the obovate blade 6-10 mm. long; stamens 6; style 3-4 mm. long, stigma bi-lobed.


Siliques ascending-erect, strongly flattened, 7-9 cm. long and about 2.5 mm. broad, the valves strongly nerved; seeds in 1 series, narrowly wing-margined all the way around.

Accepted Name:
Erysimum occidentale (S. Watson) B.L. Rob.
Publication: Syn. Fl. N. Amer. 1(1,1): 144. 1895.

Synonyms & Misapplications:
Cheiranthus occidentalis S. Watson
Cheirinia occidentalis (S. Watson) Tidestr.
Additional Resources:

PNW Herbaria: Specimen records of Erysimum occidentale in the Consortium of Pacific Northwest Herbaria database

WA Flora Checklist: Erysimum occidentale checklist entry

OregonFlora: Erysimum occidentale information

E-Flora BC: Erysimum occidentale atlas page

CalPhotos: Erysimum occidentale photos

45 photographs:
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