Trees 10-30 m tall, sometimes deciduous. Young branches brownish gray when dry, puberulent, with small lenticels, leaf scars obvious. Leaves alternate, odd-pinnate; petiole and rachis 25-30 cm, puberulent, with lenticels; leaflets 9 or 11, opposite; petiolules 5-8 mm; leaflet blades ovate, elliptic, or oblanceolate, 6-7 × 2.8-4.2 cm for basal leaflets and 15-20(-25) × 4-7 cm for apical leaflets, membranous to papery, both surfaces glabrous, base ± oblique and rounded to cuneate, apex shortly acuminate. Thyrses arising from old and second-year branches, 3-5-fascicled, rarely solitary, 5-7 cm, brown pubescent, sessile; branches 4-5 cm, with bractlets. Flowers ca. 1 cm in diam. Pedicel ca. 5 mm, slender, gray pubescent. Calyx cup-shaped, less than 5 mm, ca. 3 mm in diam., 5-parted, outside densely tomentose. Petals 5(or 6), white, 6-7 × 1.5-2 mm, outside puberulent. Staminal tube urceolate, 4-5 mm, glabrous, basal part ca. 3 mm wide, mouth ca. 5 mm wide, apical margin undulate; anthers 10(-12), ovoid, inserted on inner side of tube mouth, alternating with and as long as tube lobes. Disk annular, ca. 1 mm high, fleshy, most of it adnate with ovary. Ovary puberulent; style puberulent; stigma as long as staminal tube, puberulent. Fl. Feb-Apr.
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