Distribution: Occurring east of the Cascades in Washington, especially in the Blue Mountains area; Washington south to California and Utah, east to Idaho.
Habitat: Open, rocky slopes, from the foothills to moderate elevations in the mountains.
Growth Duration: Perennial
Conservation Status: Not of concern
Perennial from a stout taproot, shrubby at the base, the numerous stems 3-8 dm. long, forming a rounded clump, glabrous throughout.
Leaves opposite, all cauline, the lowermost reduced, the others numerous, sessile, lanceolate to broadly oblong, 4-10 cm. long and 1-3 cm. wide, sharply serrate or occasionally sub-entire.
Inflorescence a narrow, terminal panicle, or nearly a raceme; calyx 2.5-6.5 mm. long, the 5 segments scarious margined and toothed, usually glabrous; corolla bright lavender to purple-violet, 25-38 mm. long, over 1 cm. wide at the mouth, glabrous inside and out except for the marginal hairs on the lobes; the 4 fertile filaments pubescent toward the tip, the lower pair exerted; anthers permanently horseshoe-shaped, 1.6-2.0 mm. long; pollen sacs remaining saccate and indehiscent on the lower half, glabrous except for the hairs along the sutures; staminode shortly exerted, with a long, white beard along the flattened tip.
Capsule 6-9 mm. long.