Coreopsis lanceolata |
Coreopsis hamiltonii |
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garden coreopsis, lance-leaf coreopsis, lance-leaf tick-seed, lanced-leaf coreopsis, sand coreopsis |
Mt. Hamilton tickseed |
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Habit | Perennials, 10–30(–60+) cm. | Annuals, (3–)10–20+ cm. |
Leaves | basal and cauline on proximal 1/4–1/3(–1/2) of plant heights; petioles 1–5(–8+) cm; blades simple or with 1–2+ lateral lobes, simple blades or terminal lobes lance-ovate or lanceolate to oblanceolate or lance-linear, 5–12 cm × 8–15(–18+) mm. |
lobes oblong to linear, 1–8(–15) × 0.5–1 mm. |
Peduncles | (8–)12–20(–35+) cm. |
3–9(–18) cm. |
Ray florets | 8; laminae 3.5–8 mm. |
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Ray laminae | yellow, 15–30+ mm. |
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Disc florets/ |
6–7.5 mm, apices yellow. |
ca. 40; corollas 2.5–3.5 mm. |
Phyllaries | deltate to lance-deltate, 8–12+ mm. |
8, ± lance-ovate, 4–8 mm. |
Calyculi | of lance-ovate to lance-linear or linear bractlets 4–8(–12) mm. |
of 3–5 oblong to linear bractlets 1–3(–5) mm. |
Cypselae | (2.6–)3–4 mm, wings ± spreading, ± chartaceous, entire. |
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Disc cypselae | narrowly oblanceolate, 4–5 mm; pappi ca. 1 mm. |
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Ray cypselae | narrowly obovate, 5–6 mm. |
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Aerial | nodes proximal to first peduncle usually 1–3(–5+), distalmost 1–3 internodes 1–2(–8+) cm. |
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Paleae | seldom basally adnate to and falling with disc cypselae. |
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2n | = 26 (+ 0–4B). |
= 24. |
Coreopsis lanceolata |
Coreopsis hamiltonii |
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Phenology | Flowering (Mar–)May–Jul(–Aug). | Flowering Mar–May. |
Habitat | Sandy soils, ditches and roadsides, other disturbed sites | Talus slopes, rocky soils |
Elevation | 30–500(–1000+) m (100–1600(–3300+) ft) | 600–1300 m (2000–4300 ft) |
Distribution |
AL; AR; FL; GA; IL; IN; KS; KY; LA; MD; MI; MO; MS; NC; NJ; NM; NY; OH; OK; PA; SC; TN; TX; VA; VT; WI; WV; BC; ON
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CA |
Discussion | Plants that have been called Coreopsis lanceolata var. villosa Michaux often have 5+ aerial internodes 6+ cm long proximal to the first peduncle; they may merit recognition as a distinct taxon or may be hybrids (or derivatives) from crosses between C. lanceolata and C. pubescens. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Source | FNA vol. 21, p. 194. | FNA vol. 21, p. 188. |
Parent taxa | Asteraceae > tribe Heliantheae > subtribe Coreopsidinae > Coreopsis > sect. Coreopsis | Asteraceae > tribe Heliantheae > subtribe Coreopsidinae > Coreopsis > sect. Pugiopappus |
Sibling taxa | ||
Synonyms | Leptosyne hamiltonii | |
Name authority | Linnaeus: Sp. Pl. 2: 908. (1753) | (Elmer) H. Sharsmith: Madroño 4: 214. (1938) |
Web links |
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