A deciduous dioecious tree to about 50 ft high; one-year-old shoots glabrous, dark purple. Leaves odd-pinnate with one to four pairs of shortly stalked leaflets, which are 3 to 6 in. long, 1[3/8] to 3 in. wide, mostly oblong-ovate or oblong-lanceolate, acuminate, entire or finely crenate, with ten to fifteen pairs of veins, glabrous except for the pilose midrib and lateral veins beneath; petiole 1 to 2 in. long, it and the rachis pilose. Male flowers in pyramidal panicles 3[1/2] to 5 in. long and 4 to 8 in. wide; petals five, white; inflorescence axes rusty-pilose. Fruits reddish, warted, about [3/8] in. wide, obtuse (not beaked) at the apex.
This species was discovered by Wilson in 1904 on Mount Omei in western Szechwan, but was apparently not introduced until seeds were collected by Roy Lancaster on the mountain in 1980 (L.594). Wilson also found it in other parts of western Szechwan. It has already flowered in cultivation.