Herbs or subshrubs, 1-2 m. Stem striped, pilose when young. Leaves
20-25(-30) cm; stipules lanceolate, 6-8 mm, acuminate; leaflets
13-25, elliptic, ovate, or lanceolate, 3-4(-6) × (0.5-)1.2-2 cm,
papery, pilose or glabrescent abaxially, gla-brous adaxially, base
cuneate or slightly cordate, apex obtuse or acute. Racemes
terminal, 15-25 cm. Flowers many, widely spaced; pedicel slender,
ca. 7 mm; bracts linear, ca. 2.5 mm. Ca-lyx campanulate, oblique;
teeth not obvious, sparsely pubes-cent. Corolla white, pale yellow,
purple-red, or red; standard obovate-spatulate, 14-15 × 6-7 mm,
apex rounded or retuse, narrowing to a claw; wings rugose, claw
equal to blade, ca. 13 mm; keel similar to wings, slightly broader,
ca. 4 mm wide. Stamens 10, free or slightly fused at base. Ovary
nearly ses-sile, hairy; ovules many; style slightly curved. Legumes
5-10 cm, slightly constricted between seeds, slightly quadrangular,
sparsely or densely pubescent or glabrescent, 4-valvate. Seeds 1-5,
red-brown or purple-brown, long ovoid, slightly com-pressed. Fl.
Jun-Aug, fr. Jul-Oct.
Scrub, hill slopes, farm fields; below 1500 m. All provinces
[India, Japan, Korea, Russia].