Trees, 10-20 m tall. Trunk 20-30 cm d.b.h. Leaflets oblong, obovate-oblong, or ovate-lanceolate, 6-12 × 2-5.5 cm, subleathery, base cuneate or obtuse, apex obtuse or caudate-acuminate. Panicle spreading, 13-20 cm; bracts and bracteoles white, broadly ovate, ovate-oblong, or oblong, bracts 1.5-3.1 cm, bracteoles 0.5-1.5 cm. Calyx tube short, 3-9 mm; lobes oblong to broadly oblong, longer than calyx tube. Petals purple, obovate, 1.6-1.9 cm including claw, apex subtruncate, emarginate. Anthers 3-4 mm; margin of cells purplish red; stami-nodes 8, or 5 or 6, unequal in length. Ovary villous along sutures, 9-14-ovuled. Legume oblong or obovoid-oblong, 15-26 × 3.5-5 cm, base rounded, dorsal and ventral sutures equal or subequal in length, dehiscent; valves flat or slightly twisted. Seeds 7-10, chestnut-brown or grayish green, shiny, oblong or obliquely broadly oblong to subglobose, 2-2.8 × 1.5-2.2 cm, margin thickened into a narrowly edged ring; testa crustaceous, inside with a layer of white spongy gelatin, ferruginous red when dry. Fl. Apr-May, fr. Aug-Sep. 2n = 24*.
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