银背柳Salix ernesti Schneid.

科名：杨柳科 Salicaceae

属名：柳属 Salix

《中国植物志》第20(2)卷240页
  133. 银背柳（西藏植物名录）
  Salix ernesti Schneid. in Sarg. Pl. Wils. 3: 47. 1916; Hand.-Mazz. Symb. Sin. 7: 77. 1929; Hao in Fedde, Rep. Beih. 93: 68. t. 18: 35. 1936; 西藏植物名录, 46. 1980. ——S. daltoniana Anderss. var. franchetiana Burkill in Journ. Linn. Soc. 26: 528. 1899; Levl. in Bull. Bot. France, 54: 298. 1909; Schneid. 1. c. 115. 1916; Hao, 1. c. 93. 1936, syn. nov. ——S. franchetiana (Burkill) Hand.-Mazz. 1. c. 67. 1927, syn. nov. ——S. pseudo-ernesti Gorz in Bull. Fan. Mem. Inst. Biol. 6(1): 5. 1935, syn. nov. ——S. wangii Gorz, 1. c. 11. 1935, syn. nov.

《Flora of China》 Vol. 4 (1999)
Salix ernestii  C. K. Schneider
银背柳   yin bei liu
Salix daltoniana Andersson var. franchetiana Burkill; S. ernestii f. glabrescens Y. L. Chou & C. F. Fang; S. ernestii var. wangii (Goerz) N. Chao; S. franchetiana (Burkill) Handel-Mazzetti; S. pseudoernestii Goerz; S. wangii Goerz.
Shrubs. Branchlets at first gray villous, glabrescent. Buds long pubescent. Petiole to 1 cm, filamentous villous; leaf blade elliptic or obovate-elliptic, ca. 11 × 4 cm, abaxially filamentous tomentose, when mature rarely glabrescent, adaxially downy, base rounded to cuneate, margin entire or indistinctly glandular denticulate distally, apex rounded, obtuse, or acute; veins raised on both surfaces; lateral veins 9-11 on each side of midvein. Flowering coetaneous. Male catkin 4-5 × ca. 1 cm; peduncle 1-3.5 cm, with normal leaflets; rachis villous; bracts obovate or obovate-oblong, ca. 2.5 mm, abaxially villous, apex rounded. Male flower: adaxial gland broader than abaxial gland; stamens 2; filaments villous proximally. Female catkin thinner than male, to 13 cm in fruit. Female flower: adaxial gland ovate-oblong, abaxial gland very small or absent; ovary downy; style ca. 1.5 mm, 2-divided; stigma filamentous, usually twisted. Capsule ca. 5 mm, pilose. Fl. May-Jun, fr. Jul-Aug.
* Mountain slopes; 2700-3500 m. Sichuan, Xizang, Yunnan