Coreopsis stillmanii

Annuals, 5-20+ cm. Leaf blades simple or 1(-2)-pinnately lobed, terminal lobes spatulate to narrow-ly oblanceolate, 1-3 mm wide. Peduncles 5-12(-20+) cm. Calyculi of 5-7+ oblong to linear bractlets 4-8(-10) mm, ciliolate near bases. Phyllaries (5-)8, ovate to lance-ovate, 4-5(-7) mm. Ray florets 5-8; laminae 8-12(-15+) mm. Disc florets 12-30+; corollas 2.5-3.5 mm. Cypselae ± obovate, 4-5 mm, not marked adaxially with red, wings corky-thickened, faces smooth or ± tuberculate, not hirtellous. 2n = 24.

Flowering Mar-May. Rocky slopes, serpentine ridges; 400-800 m; Calif.