Rudbeckia floridana T. V. Moore var. angustifolia T. V. Moore, Pittonia 4: 176. 1900; R. divergens T. V. Moore

Annuals, biennials, or perennials. Stems branched mostly at or near mid heights, leafy toward bases. Leaves: basal blades oblanceolate, 0.5–2.5 cm wide; cauline narrowly elliptic (smaller distally); margins entire or serrate; faces hispid to ± sericeous. Peduncles at least ¹/2 plant heights. 2n = 38.

Flowering spring–summer. Meadows, pastures, old fields, roadsides; 20–80 m; Ala., Fla., Ga., La., Miss., S.C., Tex.

Variety angustifolia grows along the Gulf coastal plain.