Coreopsis hamiltonii

Annuals, (3-)10-20+ cm. Leaf lobes oblong to linear, 1-8(-15) × 0.5-1 mm. Peduncles 3-9(-18) cm. Calyculi of 3-5 oblong to linear bractlets 1-3(-5) mm. Phyllaries 8, ± lance-ovate, 4-8 mm. Ray florets 8; laminae 3.5-8 mm. Disc florets ca. 40; corollas 2.5-3.5 mm. Paleae seldom basally adnate to and falling with disc cypselae. Ray cypselae narrowly obovate, 5-6 mm. Disc cypselae narrowly oblanceolate, 4-5 mm; pappi ca. 1 mm. 2n = 24.

Flowering Mar-May. Talus slopes, rocky soils; 600-1300 m; Calif.