Boechera paddoensis
Mt. Adams rockcress

Distribution: Occurring east of the Cascades crest in the Mt. Adams area; Washington south to northeastern Oregon.

Habitat: Alpine slopes and talus.

Flowers: July-August

Origin: Native

Conservation Status: Not of concern


Long-lived perennials, from a typically woody crown; stems simple or few-branched from each caudex branch, 10-25 cm tall, glabrous throughout.


Basal leaves narrowly oblanceolate, usually 1-3 mm broad, margins entire or rarely with few teeth near apex, not ciliate, sparsely pubescent above and beneath, 2-8-rayed trichomes short-stalked and up to 0.2 mm; cauline leaves 4-8, not hiding stem, lobe-like appendages at base 1-2 mm, surfaces becoming glabrous towards ends of stems.


Inflorescence usually 5-12-flowered, typically unbranched racemes; fruiting pedicels spreading-ascending to rarely horizontally spreading, not curved, 2-5 mm, glabrous, secund or often weakly so; flowers ascending; sepals 4, glabrous; petals 4, purple to light purple, 4.5-5 mm long and 1-1.5 mm broad, glabrous; pollen spheroid.


Siliques 3.5-5 cm long and 1.5-2 mm broad, spreading-ascending or uncommonly spreading horizontally, not appressed to rachis, not curved, with parallel edges; valves glabrous; seeds in 1 series, 1.1-1.5 mm long and 0.9-1.3 mm broad, with a continuous wing to 0.3 mm broad.

Accepted Name:
Boechera paddoensis (Rollins) Windham & Al-Shehbaz
Publication: Harvard Pap. Bot. 11: 268. 2007. 2007.

Synonyms & Misapplications:
Arabis lemmonii S. Watson var. paddoensis Rollins [HC]
Additional Resources:

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

WA Flora Checklist: Boechera paddoensis checklist entry.

E-Flora BC: Boechera paddoensis atlas page.

CalPhotos: Boechera paddoensis photos.

USDA Plants: Boechera paddoensis information.

4 photographs:
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