Coreopsis sect. Coreopsis in Flora of North America @ efloras.org

308f. Coreopsis Linnaeus 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.

Species 7 (7 in the flora): mostly c, e North America.

1 Annuals (rarely persisting); ray laminae yellow, usually each with proximal red-brown to purple flecks, spot, or band (2)

+ Perennials (sometimes flowering first year); ray laminae yellow (without red-brown or purple near bases) (3)

2 (1) 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 16 Coreopsis basalis

+ 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 17 Coreopsis nuecensis

3 (1) Plants usually stoloniferous; wings of cypselae 0 or involute, ± corky 18 Coreopsis auriculata

+ Plants not stoloniferous (± rhizomatous or bases ± cormose); wings of cypselae ± spreading, ± chartaceous. (4)

4 (3) 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 19 Coreopsis lanceolata

+ 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 (4) 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 20 Coreopsis grandiflora

+ 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 (5) Simple leaf blades or terminal lobes oblong-elliptic or ovate to elliptic, 45–95+ × 22–35 mm; phyllaries 9–12 mm 21 Coreopsis intermedia

+ Simple leaf blades or terminal lobes lance-elliptic to oblanceolate or lanceolate, 15–60(–80) × 2–25(–35)mm; phyllaries 5–8+ mm 22 Coreopsis pubescens

Lower Taxa