Coreopsis sect. Eublepharis
Trans. Amer. Philos. Soc., n. s. 7: 359. 1841.
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 redbrown to purple or apices redbrown 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.
e, se North America
Species 4 (4 in the flora).
|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|
"broader" is not a number.