Coreopsis lanceolata
Coreopsis delphiniifolia
garden coreopsis, lance-leaf coreopsis, lance-leaf tick-seed, lanced-leaf coreopsis, sand coreopsis
larkspurleaf tickseed
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.
petioles 0–1 mm;
blades simple or 3-foliolate, simple blades or leaflets usually narrowly lanceolate to lance-linear, 35–80 × 2–5(–7) mm (seldom lobed, sometimes parted into 2–3+ lance-linear to ± linear lobes).
(8–)12–20(–35+) cm.
15–45+ mm.
yellow, 15–30+ mm.
15–25(–30) mm.
6–7.5 mm, apices yellow.
25–60+;
corollas yellow (often drying blackish), 5–6 mm.
deltate to lance-deltate, 8–12+ mm.
8, oblong-ovate, 5–6+ mm.
of lance-ovate to lance-linear or linear bractlets 4–8(–12) mm.
of 8–10 linear bractlets 3–5(–7) mm.
(2.6–)3–4 mm, wings ± spreading, ± chartaceous, entire.
oblong, 4.5–6 mm.
nodes proximal to first peduncle usually 1–3(–5+), distalmost 1–3 internodes 1–2(–8+) cm.
(± mid stem) 3–8 cm.
= 26 (+ 0–4B).
= 52, 78, 104.
Coreopsis lanceolata
Coreopsis delphiniifolia
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.)
Plants treated here as Coreopsis delphiniifolia are questionably distinct from C. major. In 1976, E. B. Smith suggested that members of the taxon he called C. ×delphiniifolia may be hybrids or progeny of hybrids involving C. verticillata and C. tripteris and, possibly, C. major. A problem with such an interpretation is that although all of the 35 or so records for C. delphiniifolia in the sense of Smith map at or near known localities for C. major, all but 2 are from well south of the known distribution of C. verticillata and only 3 are from near known localities for C. tripteris.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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