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Calyx (7)8–12(14) mm long (in other areas often 6–9 mm), appressed grey or brown villous, the teeth 2–4 times as long as the tube, subequal or the lower one longer than the others, the two upper teeth joined for ¼–½ their length, the lower teeth channelled and strongly curved.
Leaves 1–3-foliolate or rarely 5-foliolate; petiole and rachis (if present) together 0.6–2.5(3) cm long; leaflets variable (see subspecies); stipules (6)9–15 × 1–2 mm (in other areas often smaller, 5–9 × 0.5–1.2 mm), narrowly triangular to linear.
Flowers in dense terminal heads surrounded or exceeded by the uppermost leaves and often also in the axils of the uppermost leaves, altogether up to 15 in number; bracts resembling stipules; pedicels 5–10(13) mm long.
Petals (17)19–26(29) mm long (in other areas commonly 15–20 mm), pink to mauve or pale purple, rarely bluish, or the keel whitish, the standard brown pubescent outside.
Stems spreading or sometimes ascending brown or rarely grey tomentose (in other areas closely appressed-pubescent).
Suffrutex producing ± unbranched (except when damaged) herbaceous aerial stems up to 35(50) cm high.
Pods 35–55 × 8–10 mm, oblong, brown tomentose to subvillous.
Staminal tube not fused above, the upper filament free.
Seeds 8–10, lying transversely, c.5 × 3 × 2 mm.
Ovary tomentose; style pubescent.
