Annuals. Leaves mostly basal, seldom cauline; alternate; blades simple or (1–)2–3-pinnately lobed. Calyculi of 5–8 bractlets. Phyllaries (5–)8(–12). Paleae ± linear. Ray florets (3–)8, usually pistillate and fertile, sometimes styliferous and sterile; laminae yellow, ± obovate to flabellate, each broadest distal to middle, apices entire or 2–3-toothed. Disc florets (12–)20–60(–100+); corollas yellow, lobes 5; style-branch apices ± truncate or deltoid. Ray cypselae ± rounded-quadrate to oblong, wings chartaceous to membranous, entire, spreading (or margins thin, winglike), not ciliolate, faces usually ± tuberculate, sometimes smooth; pappi 0. Disc cypselae spatulate to oblong, wings chartaceous to membranous, entire, spreading (or margins thin, winglike), ciliolate, faces usually ± tuberculate, sometimes smooth; pappi of 2 lanceolate to subulate scales 1–4(–5+) mm. x = 12.

Distribution

Calif.

Discussion

Species 3 (3 in the flora).

Selected References

None.

Lower Taxa

Coreopsis bigelovii, Coreopsis calliopsidea, Coreopsis hamiltonii

Key

1	Calyculi of ovate-deltate bractlets (3–)4–6+ mm; scales of pappi 3–4(–5) mm	Coreopsis calliopsidea
1	Calyculi of oblong to linear bractlets (1–)3–8+ mm; scales of pappi 1–3 mm	> 2
2	Ray laminae (5–)12–20+ mm; paleae basally adnate to and falling with cypselae; scalesof pappi 2–3 mm	Coreopsis bigelovii
2	Ray laminae 3.5–8 mm; paleae not adnate to and falling with cypselae; scales of pappi ca. 1 mm	Coreopsis hamiltonii