Prostrate slender shrub with branches up to 4 dm. or occ. 8 dm. long; branchlets 1-2 mm. wide, compressed, striate, sparsely hairy. Lvs 1-3-foliolate; lflts ± linear, glab. or nearly so. Infl. of short 2-3-fld racemes on pilose peduncles hardly > 3 mm. long. Fls ± 4 × 3 mm., on minute ± pilose pedicels. Calyx c. 2 × 1 mm., glab. or nearly so; teeth minute, blunt. Standard white, with purple basal blotch and purple veins; keel whitish, auricles pointed; wings white, auricles bluntly pointed. Pods 3-4 × 2-3 mm., ovoid, turgid, dark brown to black; beak stout to slender, ± 1 mm. long, stylar portion long-persistent. Seeds yellowish brown, ± heavily black-mottled.