Trees; bark rough, dark brown, flaking. Leaves with long-handled, even-pinnate, 30-50 cm long or longer; leaflets 16-20, opposite or alternate, papery, ovate-lanceolate or ovate oblong, 9-15 cm long , 2.5-4 cm wide, apex tip of the tail, rounded base side, the other side of the wedge-shaped, asymmetrical, margin entire or alienated small serrated on both sides had no hair, no spots, often has pale green on the back side veins 18-24 on each side strip, flat, almost at right angles with the midrib out back slightly raised; small petiole 5-10 mm. Panicles and leaves, or longer, to be sparse and sometimes rusty pubescent or nearly hairless, cymules born small short branches, more flowers; flowers 4-5 mm long, with short peduncle; calyx 5 teeth crack or sinuolate, pubescent outside, and there eyelashes; petals 5, white, oblong, apex obtuse, 4-5 mm long, 2-3 mm wide, glabrous; stamens 10, in which five can education, 5 degradation; faceplate hairless, torulose; ovary conical, there are five fine grooves, hairless, every room has eight ovules, style longer than the ovary, stigma discoid. Capsule narrowly elliptic, 2-3.5 cm long, dark brown, with pale lenticels small, thin petals fruit; seed base often obtuse, top with long membranous wings, the lower end of the wingless. Flowering from June to August, the fruit of the mountain was born in October-December weed or woodland, also widely cultivated throughout. [2] temperate, subtropical species. Hi light, seedling little shade.