Erect, virgately much-branched shrub up to c. 2 m. tall. Branches ∞; branchlets slender, ± terete, striate, c. 1 mm. diam., ± pilose when young. Young plants lfy, adults with few or no lvs; lflts minute, ± hairy. Infl. of 1-3 racemes per notch, on short us. glab. peduncles. Fls 2-5, lax, c. 4 × 4 mm. on us. glab. pedicels. Calyx glab. or nearly so, campanulate, c. 2 × 2 mm.; teeth short, acute to subacute. Standard > keel, broad, white, purple-veined; keel whitish, purple-veined, long-clawed, auricles rounded; wings white, auricles rounded. Ovary glab. Pods 6-8 × 3 mm., obliquely oblong, ± turgid, ± narrowed to apex and base, light to dark brown; beak ± 1 mm., straight, subulate. Seeds (1)-2-4, pale green, heavily black-mottled.