China Flora: ree, up to 30 meters high. Young branches are yellow-brown, densely covered with yellow long soft hairs, which gradually fall off later. Leaves are ovate-elliptic, oblong or ovate-lanceolate, 5-14 cm long, with acuminate or pointed apex, rounded or nearly cordate base, densely covered with long soft hairs on both sides when young, densely covered with resin glandular dots below, with beards in the vein axils, with irregular slightly incurved spinous hair-like double serrations, and 13-14 pairs of lateral veins; petioles are 0.8-1.5 cm long, densely covered with yellow soft hairs. Female inflorescences are twin, slender cylindrical, drooping, 2.5-10 cm long, peduncles are 0.7-1 cm long, densely covered with yellow soft hairs; bracts are oblong-lanceolate, 2-3 mm long, sparsely covered with soft hairs at the bottom, with ciliated edges, spongy base, 3-lobed at the top, the middle lobe is ovate-lanceolate, and the lateral lobes are 1/3 the length of the middle lobe. The nutlets are ovate or oblong, about 2 mm long, densely pubescent at the top, with membranous wings twice as wide as the fruit, and part of the bracts are exposed. Fruiting period is July.

It is native to northwest Yunnan and southeast Tibet, growing in forests at an altitude of 1,400-2,800 meters. It is also distributed in India.

[translated from Higher Plants of China]