Helianthus hirsutus
Helianthus eggertii
hairy sunflower
Eggert's sunflower
erect, hirsute.
erect, glabrous (distinctively bluish, glacous).
cauline; mostly opposite;
petioles 0.4–2 cm;
blades (3-nerved from bases) lanceolate to ovate, 6.5–18 × 1–8 cm, bases truncate to broadly rounded or cuneate, margins subentire to serrate (flat), abaxial faces ± hirsute, gland-dotted (adaxial not gland-dotted).
cauline; all or mostly opposite;
sessile;
blades (1-nerved) lanceolate to lance-ovate, 7–16.5 × 1.5–3.5 cm, bases cuneate, margins entire or serrulate, faces glabrous (abaxial) or strumose (adaxial), gland-dotted.
1–5 cm.
1–4 cm.
hemispheric, 10–25 mm diam.
hemispheric, 10–25 mm diam.
10–15;
laminae 15–20 mm.
10–18;
laminae 15–20 mm.
40+;
corollas 5.5–6.5 mm, lobes yellow;
anthers dark brown or black, appendages dark or yellowish.
70+;
corollas 5–7 mm, lobes yellow;
anthers dark, appendages dark or ± yellowish.
18–25 (usually loose, spreading, not reflexed), lanceolate, 7–12 × 2.5–3.5 mm, (margins ciliate) apices acute to short-acuminate, abaxial faces not gland-dotted.
30–38, lanceolate, 12–16 × 3.5–4.5 mm, (margins ciliate) apices acuminate, abaxial faces glabrate, not gland-dotted.
1–7.
1–5.
4–4.5 mm, glabrate or distally puberulent;
pappi of 2 aristate scales 2.5–3.2 mm.
4–6 mm, glabrous;
pappi of 2 aristate scales 3–4 mm plus 0–1 deltate scales 0.5–1 mm.
7–10 mm, 3-toothed (apices yellowish, hairy).
9–11 mm, entire or ± 3-toothed (apices deltate).
= 68.
= 102.
Helianthus hirsutus
Helianthus eggertii
Helianthus hirsutus is distinguished from H. strumosus by hairy stems and usually yellow (as opposed to dark) anther appendages, and from H. divaricatus by petioles and leaf blades 3-nerved distal to bases. Mexican plants of H. hirsutus are sometimes labeled with the synonymous H. leptocaulis (S. Watson) S. F. Blake, and plants from Mexico and the southwestern United States often have leaf bases cuneate rather than truncate.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Helianthus eggertii is similar to H. strumosus and H. laevigatus; it is distinguished by the distinctive blue coloration of stems and leaves and by the leaves usually 1-nerved, in contrast to the 3-nerved condition typical for the genus. It is listed federally as an endangered species; R. L. Jones (1994) found it to be more common than was previously thought, and it is now in the process of being removed from the federal list.
of conservation concern
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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