西南杨 xi nan yang

Populus cathayana Rehder var. schneideri Rehder, J. Arnold Arbor. 12: 63. 1931; P. yatungensis (C. Wang & P. Y. Fu) C. Wang & Tung var. trichorachis C. Wang & Tung.

Trees. Older branches gray brown, densely pilose; juvenile branchlets gray purple, angled. Petiole terete, 1.5-4 cm, densely puberulent; leaf blade ovate or narrowly ovate, 5.5-9.5 × 3-5.5 cm, abaxially glaucous, adaxially dark green, both surfaces densely puberulent along veins, base rounded, margin glandular crenate-serrate, ciliate; lateral veins ca. 7 each side of prominent midvein, conspicuous. Fruiting catkin 10-13 cm; rachis densely pubescent. Capsule ovoid, ca. 5 mm, villous, 3- or 4-valved; stipe ca. 1.5 mm or capsule subsessile. Fl. Apr, fr. May-Jun.

* Mountains; 2500-3000 m. Sichuan, Xizang, Yunnan