Shrub up to c. 5 dm. tall, main branches procumbent, secondary ascending; branchlets ascending, much-compressed, ± 5-10 cm. × (1)-2-(3) mm., glab. Lvs 3-5-foliolate; lflts obcordate, 3-5 mm. long. Infl. of 1-3 racemes per notch, subumbellately 3-5-fld on ± pilose peduncles 3-5 mm. long. Fls ± 5 × 4 mm. on pilose pedicels c. 1 mm. long. Calyx glab., c. 2 mm. long; teeth triangular, blunt. "Standard dark purple at the centre and upper margin, heavily striped on the outer lobes; keel whitish, dull purple at the tip, auricles rounded; wings whitish, faintly striped at the tip, auricles pointed." Ovary glab. Pods obliquely elliptic-oblong, ± 10-12-(15) × 3-4 mm., slightly compressed, very dark brown to black; beak straight, stiff, c. 2 mm. long. Seeds 2-4, dark red, heavily black-mottled.