Spreadingpod rockcress

Appearance

General:
Biennial or short-lived perennial from a simple or branched crown, with 1-several simple or upwardly branching, erect stems 2.5-8 dm. tall, pubescent at the base with appressed, 3-forked hairs and some simple hairs; generally glabrous above.
Leaves:
Leaves numerous, with a basal rosette of narrowly oblanceolate leaves 3-6 cm. long and 3-8 mm. wide, acute, narrowed to a slender petiole; cauline leaves alternate, strongly overlapping, sessile and auriculate, the upper glabrous, the lower as the basal.
Flowers:
Inflorescence of many-flowered racemes, greatly elongate in fruit; pedicles 7-15 mm. long, erect or spreading; sepals 4, 3-5 mm. long, glabrous; petals 4, pink to purplish-red, 6-9 mm. long; stamens 6; style lacking.
Fruit:
Siliques glabrous, usually spreading to erect, mostly straight, 3-8 cm. long and 1.5-2.5 mm. wide; seeds mostly in 1 series, 2 mm. long, with a wing 0.5 mm. broad.

Naming

Arabis ×divaricarpa A. Nelson [HC, Rollins 1993a]
Arabis divaricarpa A. Nels. var. divaricarpa [VPPNW2]

Distribution

Occurring on both sides of the Cascades crest in Washington, and in the Olympic Mountains; Alaska south to California, east to the Rocky Mountains.

Habitat

From middle elevations to subalpine areas in the mountains.