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308g. Coreopsis Linnaeus sect. Eublepharis Nuttall, 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 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.
Species 4 (4 in the flora): e, se North America.
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| 1 |
Leaves lacking blades (petioles ± terete, 5–30+ cm × 0.5–2+ mm, functionally equivalent to leaves) |
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23 Coreopsis nudata |
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Leaves with blades (petioles not 5–30+ cm × 0.5–2 mm) |
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(2) |
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| 2 (1) |
Ray corollas ± pinkish to white; cypselae 1.3–1.8 mm, not winged |
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24 Coreopsis rosea |
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Ray corollas yellow; cypselae 3–4.5 mm, wings ± pectinate |
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(3) |
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| 3 (2) |
Leaves all opposite; petioles ± ciliate; wings of cypselae 0.1 mm wide; pappi of 1–2 cusps 0.1–0.2 mm |
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25 Coreopsis integrifolia |
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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 |
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26 Coreopsis gladiata |
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Lower Taxa
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