Silphium brachiatum

Plants caulescent, 65–200 cm; fibrous rooted. Stems terete, glabrous. Leaves: basal caducous; cauline opposite, petiolate; blades lanceolate, hastate, ovate, or sagittate, 1–24 × 0.5–18 cm, bases cuneate, or round (distal), or cordate, truncate, hastate, or sagittate (proximal), margins coarsely dentate or entire, apices acuminate to acute, faces sparsely hirsute, hispid, or scabrous. Phyllaries 11–15 in 2–3 series, outer reflexed or appressed, apices acute, abaxial faces scabrous. Ray florets 7–9; corollas yellow. Disc florets 20–40; corollas yellow. Cypselae 7–8 × 5–6 mm; pappi 0.5–1 mm. 2n = 14.

Phenology: Flowering late summer–fall.
Habitat: Open forests, calcareous soils, roadcuts
Elevation: 200–600 m

Ala., Ga., Tenn.

Discussion

Selected References

None.

Lower Taxa