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garden coreopsis, lance-leaf coreopsis, lance-leaf tick-seed, lanced-leaf coreopsis, sand coreopsis

Mt. Hamilton tickseed

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.

Ray laminae

yellow, 15–30+ mm.

Disc florets/Disc corollas

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.

Disc cypselae

narrowly oblanceolate, 4–5 mm;

pappi ca. 1 mm.

Ray cypselae

narrowly obovate, 5–6 mm.

Aerial

nodes proximal to first peduncle usually 1–3(–5+), distalmost 1–3 internodes 1–2(–8+) cm.

Paleae

seldom basally adnate to and falling with disc cypselae.

2n

= 26 (+ 0–4B).

= 24.

Coreopsis lanceolata

Coreopsis hamiltonii

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
from FNA
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
[WildflowerSearch map]
[BONAP county map]
from FNA
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.)

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
C. auriculata, C. basalis, C. bigelovii, C. californica, C. calliopsidea, C. delphiniifolia, C. douglasii, C. gigantea, C. gladiata, C. grandiflora, C. hamiltonii, C. integrifolia, C. intermedia, C. latifolia, C. leavenworthii, C. major, C. maritima, C. nudata, C. nuecensis, C. palmata, C. pubescens, C. pulchra, C. rosea, C. stillmanii, C. tinctoria, C. tripteris, C. verticillata
C. auriculata, C. basalis, C. bigelovii, C. californica, C. calliopsidea, C. delphiniifolia, C. douglasii, C. gigantea, C. gladiata, C. grandiflora, C. integrifolia, C. intermedia, C. lanceolata, C. latifolia, C. leavenworthii, C. major, C. maritima, C. nudata, C. nuecensis, C. palmata, C. pubescens, C. pulchra, C. rosea, C. stillmanii, C. tinctoria, C. tripteris, C. verticillata
Synonyms Leptosyne hamiltonii
Name authority Linnaeus: Sp. Pl. 2: 908. (1753) (Elmer) H. Sharsmith: Madroño 4: 214. (1938)
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