Herbs perennial. Stems pros­trate to decumbent or ascending, 10–70 cm, strigose or strigose-sericeous to hirsute-villous. Leaves unifoliolate; stipules lanceolate-auriculate or trian­gular, with 2 distinct lobes, decurrent on mid and distal stems, 2–10 mm; blade broadly elliptic, elliptic-ovate, ovate, broadly lanceolate, linear, linear-lanceolate, or obovate-oblanceolate, 9–50 mm, length 1–2.5(–12) times width, surfaces strigose to strigose-hirsute. Racemes (1 or)2–5-flowered, terminal, subter­minal, or lateral, 4–20 cm; bracts persistent, linear-subulate to lanceolate. Flowers: calyx broadly cylin­drical, 5–9 mm, lobes triangular-lanceolate, gla­brous or slightly puberulous; corolla bright yellow, ban­ner sometimes red-lined, 7–13 mm. Legumes 12–28 × 7–12 mm, glabrous.

Distribution

se United States, Mexico, Central America.

Discussion

Varieties 2 (2 in the flora).

Selected References

None.

Lower Taxa

Crotalaria rotundifolia var. linaria, Crotalaria rotundifolia var. rotundifolia

Key

1	Leaves usually spreading, blades broadly elliptic to elliptic-ovate, ovate, or broadly lanceolate, 9–20 × 10–15 mm, lengths mostly 1–2.5 times widths.	Crotalaria rotundifolia var. rotundifolia
1	Leaves usually ascending-erect, blades linear to linear-lanceolate, or obovate-oblanceolate on proximal 1/3 of stems, linear distally, 10–50 × 1–4 mm, lengths 5–12 times widths.	Crotalaria rotundifolia var. linaria