Crotalaria uliginosa R.F.Huang

Herbs, to 20 cm tall. Stems branched at base, glabrescent. Stipules acicular, ca. 1 mm. Leaves simple; petiole to ca. 0.5 mm; leaf blade on basal part of branches oblong-oblanceolate to oblong-elliptic but linear-elliptic toward tips of branches, 7-15 × 3-5 mm, abaxially sparsely appressed pubescent, adaxially glabrous, midvein abaxially raised, base broadly cuneate to rounded, apex obtuse to rarely truncate and mucronate. Ra­cemes leaf-opposed, (1 or)2-or 3-flowered. Pedicel 2-3 mm; bracteoles inserted at base of calyx tube, linear, ca. 0.5 mm. Calyx 2-lipped, 4-5 mm; lobes lanceolate, apex acuminate. Corolla yellow; standard broadly obovate, 4-5 × 3-4 mm, base with 2 appendages, apex obtuse; wings oblong, ca. 4 mm; keel slightly longer than wings, rounded to 90°, narrowed apically from middle and extended into a long twisted beak. Ovary sub­sessile; style ca. 2.5 mm. Legume cylindric, 10-15 × ca. 5 mm, 7-15-seeded, glabrous, base with persistent calyx and fila­ments. Seeds brown, reniform, ca. 1 mm, shiny.