Large, deciduous, lofty tree, up to 25 m tall; bark bitter, rough; branches tomentose with persistent leaf-scars; leaves compound, large about 30 cm long or more, alternate, unequally pinnate, rachis grooved; leaflets 9-14 pairs, elliptic to ovate-lanceolate, base unequal, margin irregularly toothed, apex acute or acuminate, pale beneath; flowers polygamous, small green in much branched lax panicles; calyx 5-lobed, equal, ovate-triangular, imbricate; petals 5, yellow, valvate, ovate to lanceolate, commonly reflexed; disk10 lobed; stamens usually 10 or twice as many as petals in bisexual flowers, filaments short, half the length of anthers, filiform, without scales; carpels 2-5, ovary deeply divided; styles connate, stigma capitate, ovule solitary in each locule; fruit 1-seeded samara, strongly veined, blunt or pointed at both ends, yellow, wings large, red, membranous, once or twice twisted at the base; seed compressed, solitary, pendulous.