Distribution: Occurring chiefly east of the Cascades crest in Washington; southern British Columbia and eastern Washington and Montana, south to Utah, Colorado and Nebraska.
Habitat: Open, wet or dry places in the valleys and plains; tolerant of alkali.
Conservation Status: Not of concern
Fibrous-rooted perennial from a crown or rhizomes, the stems clustered, 3-20 dm. tall; herbage rough with usually spreading hairs.
Leaves opposite, numerous, firm, linear, often spine-tipped, up to 7 cm. long and 5 mm. wide.
Heads numerous, small, the disk only 4-8 mm. wide, somewhat one-sided on the ascending branches; involucre 4-6 mm. high, its bracts imbricate, the outer with green tips, obtuse or rounded, spine-tipped; rays white, 15-25, 3-8 mm. long.