Helianthus atrorubens
Helianthus carnosus
purpledisc sunflower, purpledisk sunflower
lakeside sunflower
erect, proximally villous to strigoso-hispid, distally hispid or glabrate.
erect, (unbranched) glabrous, eglandular.
mostly basal; opposite;
petioles 4–25 cm (usually winged at least 1/2 their lengths);
blades lanceolate to ovate, 7–26 × 3–10 cm, bases broadly cuneate to nearly truncate (often decurrent onto petioles), margins serrate to crenate, abaxial faces strigoso-hispid (hairs of midribs1+ mm), not gland-dotted (cauline to 8 pairs proximal to heads, ovate to elliptic, smaller).
mostly basal; opposite (proximal) or alternate;
petioles obscure (intergrading with blades);
blades lanceolate to lance-linear or linear, 10–25 × 0.5–1.5 cm, bases cuneate, margins entire, faces glabrous, not gland-dotted (cauline 1–5 pairs, smaller).
0.3–17 cm.
5–10 cm.
broadly hemispheric, 9–16 mm diam.
broadly hemispheric, 17–25 mm diam.
10–15;
laminae 15–22 mm (abaxial faces not gland-dotted).
12–17;
laminae 20–40 mm, (abaxial faces not gland-dotted).
75+;
corollas 4–6 mm, lobes reddish;
anthers dark, appendages dark (style branches yellow).
100+;
corollas 6–6.5 mm, lobes yellow;
anthers dark, appendages yellowish or dark.
15–22, broadly ovate to oblong, 7–9 × 4–5 mm, (margins ciliolate) apices obtuse to acute, sometimes mucronate, abaxial faces usually glabrous.
(green with purple veins) 25–30, ovate to lance-ovate, 8–16 × 3–5 mm, apices acuminate, abaxial faces usually glabrous, sometimes puberulent.
(1–)3–15+.
1(–3).
2.8–3 mm, glabrous or distally puberulent;
pappi of 2 aristate scales 2.5–2.8 mm.
3 mm, glabrous;
pappi of 2 aristate scales 1.5–2 mm plus 2–4 erose scales 0.3–0.6 mm.
4–5.5 mm, ± 3-toothed to entire.
8–9 mm, 3-toothed (middle teeth long-acuminate).
= 34.
= 34.
Helianthus atrorubens
Helianthus carnosus
Helianthus atrorubens and H. silphioides form a morphologically similar pair of species that share the distinctive feature of relatively broad, tightly appressed phyllaries with apices obtuse to acute. Helianthus atrorubens has a more easterly geographic distribution along the Piedmont and the Atlantic coastal plain and the southern Appalachian Mountains; distribution of H. silphioides is centered in the Ozark region. In general, H. silphioides differs in its usually well developed cauline leaves, and basal leaves with winged petioles that are less than half the total lengths. Involucres with phyllaries tightly appressed are also observed in H. occidentalis and H. pauciflorus subsp. pauciflorus, which differs in having the phyllary apices acute to acuminate as well as in usually having abaxial faces of leaves and ray laminae densely gland-dotted.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Of conservation concern.
Helianthus carnosus is distinctive in morphology and is known from relatively few counties in northeastern Florida.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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