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Leaves 3-foliolate; leaflets 3–17.5 × 1–6.5 cm, oblong-elliptic to ovate-lanceolate or lanceolate, rounded to acute and mucronulate at the apex, rounded or slightly subcordate at the base, glabrous on upper surface except for the midrib, appressed-hairy on the main venation beneath and with sparse to dense shorter hairs between; petiole 0.7–6 cm long, sometimes rather thick and channelled; rhachis 0.6–2 cm long; petiolules 2.5–5 mm long; stipules 7–18 × 2.5–5 mm, ovate-lanceolate, striate, ciliate, persistent.
Inflorescences terminal, mostly dense, 9–30 cm long, finely puberulous and with uncinulate pubescence; peduncle 10–25 mm long; pedicels 2.5–4.5 mm long, puberulous; primary bracts each subtending 2 pedicels, 3–9 × 0.7–2.5 mm, lanceolate, striate, pubescent and ciliate, deciduous; secondary bracts very small.
Fruits 3–4.5 cm long, of 3–7 articles, each article 4.5–8.5 × 2.5–3.5 mm, oblong, distinctly thickened particularly at the margins, finely puberulous and with longer pubescence, with raised reticulation of veins when mature, only slightly constricted, the necks being only slightly narrower than the articles.
Standard pinkish-purple becoming blue, or white, yellow or greenish-yellow, 6.5 × 5 mm, obovate; wings pink, purple or yellow-green, mauve at apex, keel pink or yellowish-green.
Calyx puberulous and with some longer hairs; tube 1 mm long; lobes 1.5–2 mm long, triangular, the upper pair joined to form an entire ovate lip.
Stems striate or wrinkled, pilose with slightly spreading or appressed hairs together with some very short pubescence.
Seeds chestnut-brown, yellow-brown or purple-brown, 2.3–4 × 1.5–2 × 0.7 mm, ellipsoid-oblong; the hilum ± central.
Red or yellowish flowers in slender more or less panicled spike-like racemes.
An erect somewhat woody subshrub 0.9–3.6 m tall.
A half-woody, erect undershrub, 3–4 ft. high
