Trees, 7-12 m tall. Trunk straight. Branches with short whitish prickles. Leaves pinnately 3-foliolate; stipules deciduous; petiole 12-15 cm, rarely with prickles; terminal leaflet broadly triangular, almost rhomboid, or broadly reniform-oblate, 7-19 × 7-24.5 cm, both surfaces glabrous, lateral veins 5-8 pairs, base nearly cordate, truncate, or broadly cuneate, margin entire, apex acute or caudate with mucro 10-15 mm. Raceme ca. 15 cm, flowers in clusters of 3 or 4. Calyx spathelike, undivided or apex slightly 2-lobed. Corolla red; standard elliptic-lanceolate or ovate-triangular, erect, 3-4.5 cm, subsessile; wings subobovate, 6-8 mm, shorter than calyx; keels much longer than wings. Ovary hairy, stipitate; style narrow, glabrous. Legume 7-12 × 0.7-1.5 cm, glabrous. Seeds 1-3 or more, light or dark brown, reniform. Fl. Mar-Jul, fr. Apr-Sep. 2n = 42.
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A large tree. It grows 35 m tall. It loses its leaves during the year. The branches grow steeply upwards and the crown is open. Young tree have sharp thorns. The leaves have 3 leaflets. The central leaflet is largest. They are 8-12 cm long and broadly oval. The young leaves have silky hairs. The flowers are about 4 cm across and bright red. They are in dense spike like clusters. The flowers are on one side. The fruit is a pod 5-10 cm long with 1-3 seeds.
Forests by rivers, mountain slopes; at elevations around 1,400 metres in China. Found in both dry and moist forests, but only regenerating in open areas.
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A tropical plant. It grows in both dry and moist forests. It grows in forests near rivers at about 1,400 m above sea level. In Yunnan.
Can be grown by cuttings or seedlings. Seeds needs soaking.
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