Trees, 6-20 m tall. Trunk to 30 cm d.b.h. or more. Bark and branchlets grayish black. Petiole 2-4.5 cm; leaf blade often purplish red when young, greenish when mature, cordate or triangular-orbicular, 5-12(-20) × 4.5-11.5(-18) cm, thickly papery to subleathery, adaxially shiny, glabrous or comose-pubescent in vein axils, principal veins (5-)7, base shallowly to deeply cordate, rarely truncate, apex obtuse or acute. Raceme short; rachis 5-10 mm, 4-12-flowered. Flowers light purplish red or pink, 1.3-1.5 cm; pedicel 1-2.3 cm, slender. Legume purplish red, broadly linear, (7-)9-15 × 1.2-1.5 cm, wing 2-2.3 mm, sutures unequal (rarely equal), dorsal suture slightly longer, base rounded to acuminate, apex acuminate; stipe 2-3 mm. Seeds 1-8, compressed, suborbicular, 6-7 × 5-6 mm. Fl. Mar-Apr, fr. Sep-Nov.
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