Perennials (sometimes flowering first year; bases ± rhizomatous or cormose). Leaves basal and cauline, usually alternate, sometimes both alternate and opposite, or all opposite; blades mostly simple, sometimes with 1–2 lateral lobes (none in C. nudata). Calyculi of 5–8(–12+) bractlets. Phyllaries (7–)8(–9). Ray florets 8(–13), neuter; laminae yellow or purple to pink or white, ± cuneate, broadest distal to middles, usually 3-lobed (middle lobes sometimes toothed). Disc florets 40–120+; corollas ochroleucous to yellow or red-brown to purple or apices red-brown to purple, lobes 4; style-branch apices ± truncate. Paleae ± linear (not distally dilated or attenuate). Cypselae obovate or oblong to linear, margins winged or not, wings ± corky to chartaceous, ± pectinate, ± spreading, not ciliolate, faces glabrous, smooth or ± tuberculate; pappi 0, or (1–)2 cusps, awns, or scales (0.1–1+ mm). x = 13.

Distribution

e, se North America.

Discussion

Species 4 (4 in the flora).

Selected References

None.

Lower Taxa

Coreopsis gladiata, Coreopsis integrifolia, Coreopsis nudata, Coreopsis rosea

Key

1	Leaves lacking blades (petioles ± terete, 5–30+ cm × 0.5–2+ mm, functionally equivalent to leaves)	Coreopsis nudata
1	Leaves with blades (petioles not 5–30+ cm × 0.5–2 mm)	> 2
2	Ray corollas ± pinkish to white; cypselae 1.3–1.8 mm, not winged	Coreopsis rosea
2	Ray corollas yellow; cypselae 3–4.5 mm, wings ± pectinate	> 3
3	Leaves all opposite; petioles ± ciliate; wings of cypselae 0.1 mm wide; pappi of 1–2 cusps 0.1–0.2 mm	Coreopsis integrifolia
3	Leaves usually all or mostly alternate, seldom some or all opposite; petioles not ciliate; wings of cypselae 0.2–0.4+ mm wide; pappi of 2, subulate scales 0.5–1+ mm	Coreopsis gladiata