Description from Flora of China
Herbs, perennial, prostrate. Roots very long. Stems angled when young, with appressed gray medifixed symmetrically 2-branched trichomes. Stipules lanceolate, 3-4 mm. Leaves 1.5-3 cm, 3-7-foliolate; petiole 1.5-3 mm, adaxially grooved, with appressed white medifixed trichomes; stipels absent; leaflet blades alternate, linear to sometimes narrowly oblong, 7-20 × 1.5-3 mm, both surfaces with appressed medifixed trichomes, secondary veins not visible, base cuneate, apex acuminate to acute and with a ca. 0.2 mm mucro. Racemes 2-3 cm, densely flowered; peduncle 5-8 mm; bracts ovate, ca. 1 mm, caducous. Peduncles, pedicels, bracts, and calyces with appressed medifixed trichomes. Pedicel 0.5-1 mm, reflexed in fruit. Calyx ca. 2.5 mm; tube ca. 0.5 mm; teeth linear, equal, ca. 3-4 × as long as tube, apex acuminate. Corolla red; standard obovate, ca. 5 × 3 mm, outside hairy, base narrowly cuneate, apex obtuse; wings obovate-oblong, glabrous; keel falcate, glabrous. Stamens ca. 4 mm; anthers globose, apex with a ca. 0.2 mm mucro. Ovary linear, densely hairy, with 8-11 ovules. Legume straight, 1.5-2.5 cm × 1.5-2 mm, with small appressed medifixed trichomes, sutures thickened; endocarp not blotched. Seeds 7-10 per legume, dark brown, ellipsoid, ca. 1.2 × 0.8 mm, both ends truncate. Fl. Aug-Sep, fr. Oct.
● Sandy ground near seashores, dry open places, sunny trailsides; below 500 m. Hainan.