Boechera puberula
Blue Mountain rockcress, hoary rockcress

Distribution: Occurring east of the Cascades crest in Washington; Washington to California, east to southern Idaho and Utah.

Habitat: Rocky slopes and hillsides among sagebrush or open woodlands.

Flowers: May-July

Origin: Native

Growth Duration: Perennial

Conservation Status: Not of concern


Short-lived perennials, from a crown not woody; stems simple from each caudex branch, 20-63 cm tall, pubescence dense near base with short-stalked trichomes, 3-8-rayed, to 0.3 mm, pubescence similar towards ends of stems.


Basal leaves oblanceolate to narrowly oblanceolate, 1.5-5 mm broad, margins typically toothed, not ciliate, densely pubescent above and beneath with 5-12-rayed trichomes on short-stalks and up to 0.2 mm; cauline leaves 7-45, hiding the stem near base, lobe-like appendages at base absent or 0.7-3 mm, surfaces pubescent towards ends of stems.


Inflorescence usually 10-40-flowered, typically unbranched racemes; fruiting pedicels pendent, curving downward towards ends to horizontally spreading to ascending at base, 4-10 mm, pubescent with trichomes appressed and branched, occasionally slightly secund; flowers ascending to descending; sepals 4, pubescent; petals 4, white to pale purple, 5-9 mm long and 0.8-1.8 mm broad, glabrous; pollen ellipsoid.

Fruits :

Siliques 3-6.5 cm long and 1.9-2.2 mm broad, closely pendent, uncommonly appressed to rachis, generally not curved, with parallel edges; valves pubescent; seeds in 1 series, 1.4-1.8 mm long and 1-1.4 mm broad, with a continuous wing to 0.3 mm broad.

Accepted Name:
Boechera puberula (Nutt.) Dorn
Publication: Brittonia. 55: 3. 2003.

Synonyms & Misapplications:
Arabis puberula Nutt. [HC]
Additional Resources:

PNW Herbaria: Specimen records of Boechera puberula in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Boechera puberula checklist entry.

E-Flora BC: Boechera puberula atlas page.

CalPhotos: Boechera puberula photos.

USDA Plants: Boechera puberula information.

13 photographs:
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