The World Flora Online

Crotalaria rotundifolia (Walter) Walter ex J.F. Gmel., Syst. Nat. 2: 1095. 1792; Anonymos rotundifolia Walter; C. rotundifolia var. vulgaris Windler.

Hierbas postradas; tallos teretes, escasamente pilosos. Folíolo 1, ampliamente elíptico a ovado, 1.8–2.4 cm de largo y 1–1.3 mm de ancho, ápice agudo a mucronulado, base redondeada a cuneada, estrigoso; pecíolos 0.1–0.2 cm de largo, estípulas ausentes o decurrente-patentes sobre el tallo. Inflorescencias 2–7 cm de largo, con 1–3 flores, pedicelos 3–4 mm de largo, brácteas lineares, 3–4 mm de largo, bractéolas 3–4 mm de largo, flores amarillas; lobos del cáliz 7 mm de largo y 5 mm de ancho; estandarte 4.5–6 mm de largo y 4–7 mm de ancho, alas 4–5 mm de largo y 3–4 mm de ancho, quilla 6–7 mm de largo y ca 6 mm de ancho, con un rostro corto. Legumbres 1.7–2 cm de largo, glabras, negras; semillas cordiformes, cafés.

Conocida en Nicaragua por una sola colección (Standley 8314) de bosques húmedos, Sierras de Managua; 800–900 m; fl y fr may; sureste de Estados Unidos a Costa Rica.

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Herb, perennial, prostrate, to 3 dm long; stem terete, sparsely sericeous, pilose. Leaves unifoliolate, the leaflets narrowly elliptic to lanceolate, apex acute, acuminate or mucronulate, the base rounded to cuneate, 18-25 mm long, 5-13 mm broad, the margins entire, above strigose, beneath strigose, the veins on each side of the midvein obscure; petiole 1-2 mm long; stipules absent or winging the stem for up to one cm. Inflorescences leaf-opposed racemes, bearing 1-3 flowers, bracts linear, 3-4 mm long; pedicels 3-4 mm long; bracteoles linear, 3-4 mm long, pilose, located on the base of the calyx. Flowers yellow, 9-10 mm long; calyx 9-10 mm long, the tube campanulate, the lobes 2-3 times as long as the tube, pilose; corolla yellow with maroon veins, 9-10 mm long, the standard 4.5- 6.0 mm long, 4-7 mm broad, retuse, the wings 4-5 mm long, the claws 2-2.5 mm long, oblong oblanceolate, oblique, the keel 6-7 mm long, the twisted beak short; stamens dimorphic, the long anthers 0.9-1.5 mm long, the short anthers 0.3-0.5 mm long; style with a pubescent stigma, sharply geniculate, 4.0-5.5 mm long. Legume inflated, 1.7-2.0 cm long, glabrous, black at maturity; seeds ca. 15, brown, oblique cordiform, to 2.5 mm long.

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Perennial from a slender root; stems spreading or decumbent, 1–4 dm; stipules ± reduced or wanting; racemes erect, open, few-fld. Dry, open woods and sandy soil; se. Va. to Fla., La., and tropical Amer. Summer. Our plants are var. vulgaris Windler, with ± spreading pubescence and relatively broad lvs mostly 2–3 times as long as wide. (C. angulata, probably misapplied)

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Herb

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native to the Southern United States, Mexico and Central America.

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