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308e. Coreopsis Linnaeus sect. Gyrophyllum Nuttall, Trans. Amer. Philos. Soc., n. s. 7: 358. 1841.
Perennials. Leaves cauline, opposite; blades usually 3-foliolate, sometimes simple or ± pinnately lobed (with 5+ leaflets), leaflets simple or each with 2–9+ lobes, or blades not 3-foliolate (then often with 3(–5+) lobes). Calyculi of 5–12+ bractlets. Phyllaries 8. Ray florets 8, neuter; laminae yellow, ± oblong-elliptic to suborbiculate, broadest at or near middle, apices entire or 2–3-toothed. Disc florets 25–80+; corollas yellow or ± red-brown to purple, lobes 5; style-branch apices ± penicillate. Paleae usually linear to subulate, often distally dilated. Cypselae obovate to oblong, wings corky to chartaceous, entire, ± spreading, not ciliolate, faces glabrous, smooth; pappi 0 or (1–)2 cusps (0.1–0.5+ mm; shoulders of wings sometimes bristly, pappus-like). x = 13.
Species 6 (6 in the flora): mostly c, e United States.
E. B. Smith (Bot. Gaz. 136: 83. 1975) used a superfluous name, sect. Palmatae (F. Boynton) E. B. Smith [based on Coreopsis (unranked) Palmatae F. Boynton in J. K. Small, Man. S.E. Fl., 1446. 1933], for sect. Gyrophyllum.
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1 |
Blades of leaves not 3-foliolate, most 3(–5+)-lobed |
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10 Coreopsis palmata |
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Blades of leaves usually 3-foliolate, leaflets simple or ± pinnately or ± pedately lobed |
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(2) |
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2 (1) |
Petioles 5–45 mm |
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11 Coreopsis tripteris |
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Petioles 0–1 mm. |
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(3) |
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3 (2) |
Leaf blades or leaflets seldom lobed, lance-ovate to lanceolate or lance-linear, 2–30 mm wide |
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(4) |
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Leaf blades or leaflets often lobed, ultimate lobes oblong to linear or filiform, 0.5–2.5 mm wide |
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(5) |
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4 (3) |
Leaf blades or leaflets (4–)6–15(–30+) mm wide |
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12 Coreopsis major |
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Leaf blades or leaflets 2–7 mm wide |
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13 Coreopsis delphiniifolia |
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5 (3) |
Internodes (± mid stem) 15–40(–60) mm; leaflets entire or each with 3–9+, ± linear to filiform lobes 5–25(–45+) × 0.5–1(–2) mm; disc corollas yellow |
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14 Coreopsis verticillata |
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Internodes (± mid stem) 8–12(–16) mm; leaflets entire or each with 2–5+, ± oblong to linear lobes 15–30+ × –1.5(–2.5+) mm; disc corollas yellow or purple |
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15 Coreopsis pulchra |
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Lower Taxa
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