Distribution: Occurring east of the Cascades crest in central and south-central Washington; central Washington to California, where native east to Idaho, Nevada, and Arizona.
Habitat: Roadsides, fields, ditches, wastelots, and other disturbed, open places at low to middle elevations.
Origin: Introduced from California
Conservation Status: Not of concern
Coarse annual 1-10 cm. tall, somewhat hairy.
Leaves alternate, numerous, pungent, rigid, the lower 2-6 cm.long, pinnatifid, the upper smaller and linear.
Heads several, hemispheric; involucre 3-5 mm. high, with firm, spine-tipped bracts each clasping the outer half of a ray achene, closely subtended by linear, spine-tipped leaves; rays 15-35, pale yellow, 4-7 mm. long, 2-toothed; disk flowers yellow, sterile; receptacle convex, chaffy throughout; pappus none.