Helianthus heterophyllus
variableleaf sunflower, wetland sunflower
erect, usually hispid to ± hirsute.
mostly basal; mostly opposite;
petioles 0–3 cm (broadly winged);
blades (3-nerved distal to bases) ovate or lanceolate to spatulate, 6–28 × 1.2–4.3 cm, bases cuneate, margins entire (often revolute), abaxial faces hispid to ± hirsute, not gland-dotted (cauline leaves relatively few, narrowly lanceolate to linear, much smaller).
10–15 cm.
broadly hemispheric, 15–25 mm diam.
12–18;
laminae 14–36 mm (abaxial faces not gland-dotted).
100+;
corollas 5.5–6.5 mm, lobes reddish;
anthers purplish, apendages purplish (style branches usually reddish).
24–30, lanceolate to lance-ovate, 8–13 × 2–5 mm, (margins sometimes ciliate) apices acute to short-acuminate or acuminate, abaxial faces sparsely hispid to glabrate.
1–3(–5).
4–5 mm, glabrate;
pappi of 2 aristate scales 1.7–2.5 mm plus 1–3 deltate scales 0.5–1.5 mm.
7–9 mm, 3-toothed (apices purplish).
= 34.
Helianthus heterophyllus
Helianthus heterophyllus is found on the Atlantic and Gulf coastal plains. The cauline leaves are usually abruptly reduced relative to the basal leaves; individuals sometimes have relatively large cauline leaves.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
LA Plants
WildflowerSearch
iNaturalist
USDA Plants Database
