Salix longiflora Wall. ex Andersson, J. Linn. Soc., Bot. 4: 50 1860.; 
China (Sichuan, Yunnan), Tibet, Bhutan, India, Nepal as per Catalogue of Life;
Salix longiflora Andersson
This species is frequently found in blue pine forest associated with Rhododendron. This collection was made from Eagle Nest, West Kameng, 2500 m.
Leaves and female catkins are important for its identification. Leaf blades elliptic-oblong to elliptic, acute, entire, cuneate, subcoriaceous, green above, grey beneath, most glabrous on both the surfaces, glaucous beneath in young leaves; petioles slender.Female catkins very slender, cylindrical, spreading-pendulous, or curved upwards with age, lax, green or reddish-green.

Thanks … for sharing another species. Very good photographs.

Thanks for sharing one more from North east India. I could not find its mention in Flowers of Himalaya.