灰背杨 hui bei yang

Trees to 10 m tall; bark gray. Branchlets brown or purplish brown, villous when young. Buds pilose. Petiole terete, short, downy; leaf blade ovate, ca. 20 × 18 cm, abaxially pale, pilose along veins, adaxially green, pubescent along veins, base shallowly cordate or truncate, apex acute. Flowers usually bisexual; disc 5-7-lobed; stamens 6-12. Fruiting catkin very long; rachis pilose. Capsule subglobose, pilose, 2-valved.

Forests; 2500-3300 m. Sichuan, Xizang, Yunnan [India, Sikkim]