Coreopsis sect. Coreopsis

Annuals or perennials. Leaves basal and cauline or mostly cauline, opposite; blades simple or ± pinnately or pedately lobed (with 3–9+ lobes). Calyculi of (6–)8(–9) bractlets. Phyllaries 8. Ray florets 8 (more in “double” cultivars), neuter; laminae yellow, sometimes each with red-brown or purple near base, ± cuneate, broadest distal to middles, apices usually ± 3-lobed (middle lobes entire or toothed). Disc florets (30–)60–150+; corollas yellow, apices yellow or red-brown to purple, lobes 5; style-branch apices ± penicillate to short-conic or truncate-mucronate. Paleae basally ± lanceolate to linear, distally attenuate (± filiform). Cypselae obovate to oblong (often cupped), margins ± winged (or wingless and margins adaxially ± corky), wings ± chartaceous, usually entire, rarely irregularly toothed to pectinate, ± spreading, not ciliolate, faces glabrous, smooth or ± papillate; pappi 0, or usually falling, of (1–)2 cusps or subulate to lanceolate scales (0.1–0.5+ mm). x = 13.

Distribution

Mostly c, e North America.

Discussion

Species 7 (7 in the flora).

Selected References

None.

Lower Taxa

Coreopsis auriculata, Coreopsis basalis, Coreopsis grandiflora, Coreopsis intermedia, Coreopsis lanceolata, Coreopsis nuecensis, Coreopsis pubescens

Key

1	Annuals (rarely persisting); ray laminae yellow, usually each with proximal red-brown to purple flecks, spot, or band	> 2
1	Perennials (sometimes flowering first year); ray laminae yellow (without red-brown or purple near bases)	> 3
2	Leaves mostly in proximal 3/4–7/8 of plant heights; calyculi of lance-deltate to linear bractlets 6–9(–12+) mm; disc corolla apices red-brown to purple; cypselae wingless	Coreopsis basalis
2	Leaves mostly in proximal 1/5–1/3(–1/2) of plant heights; calyculi of deltate to lance-oblong bractlets 4–6(–8) mm; disc corolla apices yellow; cypselae winged	Coreopsis nuecensis
3	Plants usually stoloniferous; wings of cypselae 0 or involute, ± corky	Coreopsis auriculata
3	Plants not stoloniferous (± rhizomatous or bases ± cormose); wings of cypselae ± spreading, ± chartaceous.	> 4
4	Aerial nodes proximal to first peduncle usually 1–3(–5+); leaves mostly on proximal 1/4–1/3(–1/2) of plant heights; cypselae (2.6–)3–4 mm	Coreopsis lanceolata
4	Aerial nodes proximal to first peduncle usually (5–)6–12+; leaves mostly on proximal 1/2–7/8 of plant heights; cypselae 2–3 mm	> 5
5	Blades of leaves rarely simple, usually irregularly 1(–2)-pinnately or ± -pedately lobed with (3–)5–9+ lobes, rarely simple, simple blades or terminal lobes narrowly lanceolate to linear or filiform, (0.5–)2–8 (–12+) mm wide	Coreopsis grandiflora
5	Blades of leaves usually simple, rarely with 1–2(–3+) lateral lobes, simple blades or terminal lobes oblong-elliptic or ovate to elliptic or lanceolate, (2–)5–35 mm wide	> 6
6	Simple leaf blades or terminal lobes oblong-elliptic or ovate to elliptic, 45–95+ × 22–35 mm; phyllaries 9–12 mm	Coreopsis intermedia
6	Simple leaf blades or terminal lobes lance-elliptic to oblanceolate or lanceolate, 15–60(–80) × 2–25(–35)mm; phyllaries 5–8+ mm	Coreopsis pubescens