Distribution: Occurring east of the Cascades crest in central Washington, where endemic to eastern Kittitas County and northeastern Yakima County.
Habitat: Generally in lithosol areas in sagebrush desert.
Conservation Status: Not of concern
Acaulescent, tap-rooted perennials, 15-30 cm. tall, with a prominent false scape clothed by 2-5 scarious sheaths; roots irregularly tuberous, up to 5 cm. long and 2 cm. wide below, elongate and slender above, the surface brown.
Leaves quinately compound and bipinnately dissected; petioles 2-6 cm. long, sheathing throughout, purplish tinged, the margins scarious; blades ovate in outline, 5-12 cm. long and 2.5-6 cm. wide, glabrous; ultimate leaf segments numerous, filiform, 1-3 cm. long and less than 1 mm. wide.
Umbels 2-5, glabrous; rays 5-15, 2-8 cm. long; involucre wanting; involucel of 3-5 bractlets, arranged on one side, 2-4 mm. long; flowers yellow, 15-20 in each umbellet, the fruiting pedicels 7-17 mm. long at maturity.
Fruit elliptic in outline, 7-9 mm. long and 3-4 mm. wide.