UW Burke Herbarium species comparison

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Erysimum cheiranthoides

Erysimum arenicola

treacle mustard, wormseed wallflower

sand-dwelling wallflower
Habit Herbaceous perennial, grayish with fine, appressed, aligned hairs, usually with several stems 1-2.5 dm. tall from a branched crown.
Leaves

Basal leaves numerous in a rosette, linear-oblanceolate to oblanceolate, 2.5-6 cm. long and 1.5-8 mm. wide, entire to deeply wavy-dentate;

cauline leaves alternate, several, variable, reduced or larger than the basal, usually deeply wavy-dentate.
Flowers

Flowers rather showy, in crowded, bractless racemes; pedicles slender, 3-10 mm. long, somewhat ascending;

sepals 4, erect, the outer pair somewhat saccate at the base;

petals 4, lemon yellow, the claw 10-15 mm. long, the blade obovate, 5-9 mm. long;

stamens 6;

style beaklike, 2-3.5 mm. long, stigma bi-lobed.
Fruits

Siliques ascending to erect, flattened, lumpy, 3-12 cm. long and 2-2.5 mm. wide, the valves strongly nerved;

seeds in 1 series, wingless.

Erysimum cheiranthoides

Erysimum arenicola
Flowering time June-August June-September
Habitat Disturbed areas including fields, roadsides and wastelots, often where moist. Open ridges and rock crevices, middle elevations to the alpine.
Distribution
Occurring chiefly east of the Cascades crest in Washington; widely distributed throughout much of North America.
[WildflowerSearch map]
[BONAP county map]
Occurring on both sides of the Cascades crest in Washington; British Columbia to Oregon.
[WildflowerSearch map]
[BONAP county map]
Origin Introduced from Eurasia Native
Conservation status Not of concern Not of concern
Sibling taxa
E. arenicola, E. capitatum, E. cheiri, E. inconspicuum, E. occidentale, E. repandum
E. capitatum, E. cheiranthoides, 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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