Helianthus heterophyllus
J. Acad. Nat. Sci. Philadelphia 7: 74. 1834.
Perennials, 50–120 cm (with crown buds). Stems erect, usually hispid to ± hirsute. Leaves 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 glanddotted (cauline leaves relatively few, narrowly lanceolate to linear, much smaller). Heads 1–3 (–5). Peduncles 10–15 cm. Involucres broadly hemispheric, 15–25 mm diam. Phyllaries 24–30, lanceolate to lanceovate, 8–13 × 2–5 mm, (margins sometimes ciliate) apices acute to short-acuminate or acuminate, abaxial faces sparsely hispid to glabrate. Paleae 7–9 mm, 3-toothed (apices purplish). Ray-florets 12–18; laminae 14–36 mm (abaxial faces not glanddotted). Disc-florets 100+; corollas 5.5–6.5 mm, lobes reddish; anthers purplish, apendages purplish (style-branches usually reddish). Cypselae 4–5 mm, glabrate; pappi of 2 aristate scales 1.7–2.5 mm plus 1–3 deltate scales 0.5–1.5 mm. 2n = 34.
Phenology: Flowering late summer–fall.
Habitat: Wet sandy soils
Elevation: 0–50+ m
Distribution
Ala., Fla., Ga., La., Miss., N.C., S.C., Tex.
Discussion
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.
Selected References
None.