[Rockcresses: The Genus Arabis (and Boechera) East of the Cascade
Mountains of Oregon and Washington]
Synonym: Arabis cusickii
The photo above shows Cusick's rockcress as seen about 3 miles south of Shaniko in central Oregon.........April 18, 2004.
photo at right shows the upright siliques of Cusick's rockcress as seen along
Divide Road south of the Jefferson-Wasco County line in north-central Oregon.........May
Cusick's rockcress has several erect, clustered stems arising
8-25 cm high. The basal leaves are linear-oblanceolate to spatulate with entire
to few-toothed margins, the leaves measuring from 1-3 cm long. The blades are
sparsely covered with coarse, stiff hairs and the margins are typically
ringed with long, stiff hairs. The stem leaves lack-heart-shaped bases and are
linear-oblong in shape.
The inflorescence is a few-flowered corymb. The purplish sepals are 4-6 mm
long and are sparsely hairy. The bright purple, pink or white petals are each
7-9 m long. The glabrous pedicels are 5-7 mm long. The fruits are ascending
and arched siliques from 4-6 cm long and 2-3 mm wide. The siliques are glabrous.
Cusick's rockcress is found on flatlands and slopes amongst sagebrush
and ponderosa pine.
Cusick's rockcress may be found from east-central Washington
south to north-central oregon and east to central Idaho.
The photo above shows the basal rosette of
leaves of Cusick's rockcress. Note the ciliate leaf margins.
The photo above shows the long, coarse hairs on the stem and
leaves of Cusick's rockcress. Photographed at the summit of Bake Oven Road several miles north of Shaniko in north-central Oregon..........April 18, 2004.
The photo above shows Cusick's rockcress as seen along Road 22 at the northern boundary of the Ochoco NF........ May 24, 1998.
The photo above shows Cusick's rockcress along Divide Road south
of the Jefferson-Wasco County line in north-central Oregon........May 15, 2001.