Helianthus microcephalus
small woodland sunflower, small-head sunflower, woodland sunflower
erect, glabrous.
cauline; opposite or alternate;
petioles 0.3–3 cm;
blades (greenish, at least abaxially, 3-nerved at bases) lanceolate, 7.2–15.5 × 1.3–4 cm, bases cuneate, margins entire or serrate, abaxial faces tomentulose, densely gland-dotted.
1–3(–8) cm.
cylindric, 5–7 mm diam.
5–8;
laminae 10–14 mm.
15–22;
corollas 4–5.5 mm, lobes yellow;
anthers dark, appendages dark.
12–17, lance-linear, 3–6.5 × 1.5–2.5 mm, (margins ciliate) apices acuminate, abaxial faces glabrate, not gland-dotted.
(1–)3–15+.
3.5–4.2 mm, glabrous;
pappi of 2 aristate scales 1.5–2.2 mm.
5–7 mm, 3-toothed (apices hairy).
= 34.
Helianthus microcephalus
Helianthus microcephalus is distinguished by its relatively small heads, which have relatively few phyllaries, ray florets, and disc florets, as well as the usually tomentulose abaxial faces of the leaves. Hybrids with H. divaricatus are known.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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