Coreopsis douglasii

Annuals, 5-15(-25+) cm. Leaf blades simple or pinnately lobed, terminal lobes filiform, 0.5-1+ mm wide. Peduncles 5-15(-20+) cm. Calyculi of (3-)5 linear bractlets 3-5(-12) mm, not ciliolate near bases. Phyllaries (5-)8, ovate, 5-7+ mm. Ray florets (5-)8(-9+); laminae 5-12(-16+) mm. Disc florets 8-60(-100+); corollas 2.8-3.5 mm. Cypselae ± oblanceolate, 3.5-4+ mm, not marked adaxially with red dots or dashes, wings usually thin, sometimes corky-thickened, faces usually smooth, rarely tuberculate, not hirtellous. 2n = 24.

Flowering Mar-May. Shale and serpentine slopes, sandy flats; (150-)300-1000 m; Calif.