UW Burke Herbarium species comparison

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Erysimum occidentale

Erysimum cheiranthoides

pale wallflower, western wallflower

treacle mustard, wormseed wallflower
Habit Grayish biennial from a simple crown, the simple, single stem 2-4.5 dm. tall.
Leaves

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

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.

Fruits

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.

Erysimum occidentale

Erysimum cheiranthoides
Flowering time March-May June-August
Habitat Sagebrush hills and valleys. Disturbed areas including fields, roadsides and wastelots, often where moist.
Distribution
Occurring east of the Cascades crest in Washington; northern Washington to eastern Oregon.
[WildflowerSearch map]
[BONAP county map]
Occurring chiefly east of the Cascades crest in Washington; widely distributed throughout much of North America.
[WildflowerSearch map]
[BONAP county map]
Origin Native Introduced from Eurasia
Conservation status Not of concern Not of concern
Sibling taxa
E. arenicola, E. capitatum, E. cheiranthoides, E. cheiri, E. inconspicuum, E. repandum
E. arenicola, E. capitatum, E. cheiri, E. inconspicuum, E. occidentale, E. repandum
Web links 
Unless otherwise noted, all data comes from the University of Washington's Burke Herbarium.



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Choose a data source: Flora of North America, OregonFlora, UW Burke Herbarium

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