Coreopsis basalis
Coreopsis delphiniifolia
golden mane tickseed, rock tickseed
larkspurleaf tickseed
basal and cauline on proximal 3/4–7/8 of plant heights;
petioles 8–35(–120) mm;
blades simple or 1(–2)-pinnately lobed with 3–9+ lobes, simple blades or terminal lobes elliptic or lanceolate to oblanceolate or linear, 25–55+ × (1–)2–9(–20) 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).
6–15+ cm.
15–45+ mm.
yellow, usually each with a proximal, red-brown to purple spot or band, 15–20+ mm.
15–25(–30) mm.
3–4 mm, apices red-brown to purple.
25–60+;
corollas yellow (often drying blackish), 5–6 mm.
lance-ovate, 7–9+ mm.
8, oblong-ovate, 5–6+ mm.
of lance-deltate to linear bractlets 6–9(–12+) mm.
of 8–10 linear bractlets 3–5(–7) mm.
1.2–1.8 mm, wingless (margins ± inrolled adaxially, ± corky).
oblong, 4.5–6 mm.
nodes proximal to first peduncle usually 5–10+, distalmost 1–3 internodes 4–7(–10) cm.
(± mid stem) 3–8 cm.
= 26.
= 52, 78, 104.
Coreopsis basalis
Coreopsis delphiniifolia
Plants in the western part of the distribution of Coreopsis basalis usually have narrower lobes of leaf blades and narrower outer phyllaries; such plants have been treated as C. wrightii or as C. basalis var. wrightii.
(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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