Coreopsis sect. Leptosyne
in H. G. A. Engler and K. Prantl, Nat. Pflanzenfam. 54[IV,5]: 243. 1891.
Annuals. Leaves mostly basal, seldom cauline; mostly alternate, sometimes opposite; blades simple or 1–2-pinnately lobed. Calyculi of (3–)5–8 bractlets. Phyllaries 5–8. Ray florets (5–)8(–12+), pistillate, fertile; laminae yellow, ± obovate or flabellate, each broadest distal to middle, apices entire or 2–3-toothed. Disc florets 8–60(–100+); corollas yellow (to orange), lobes 5; style-branch apices ± truncate or deltoid. Paleae oblong or lanceolate to linear. Cypselae ± oblong to spatulate, wings ± corky to chartaceous, entire, ± spreading, not ciliolate, faces smooth or ± tuberculate; pappi 0 or coroniform (0.1–0.2 mm). x = 12.
Calif., nw Mexico.
Species 3 (3 in the flora).
The name Coreopsis sect. Leptosyne has been misattributed to S. F. Blake, Proc. Amer. Acad. Arts 49: 341. 1913.
|1||Leaf blades simple or 1(–2)-pinnately lobed, terminal lobes spatulate to narrowly oblanceolate, 1–3 mm wide; calyculus bractlets ciliolate near bases||Coreopsis stillmanii|
|1||Leaf blades simple or pinnately lobed, terminal lobes filiform to linear, 0.5–1(–1.5) mm wide; calyculus bractlets not ciliolate||> 2|
|2||Cypselae marked adaxially with red dots or dashes near wing/body interface, wings ± corky-thickened, faces ± tuberculate and/or hirtellous||Coreopsis californica|
|2||Cypselae not marked adaxially with red, wings usually thin, sometimes corky-thick-ened, faces usually smooth, rarely tuberculate, not hirtellous||Coreopsis douglasii|