I think we can assume it as Tamarix ramosissima for now, as the Ladakh checklist by L. Klimeš and B. Dickoré lists it, and also the paper BULL. BOT. SURV. INDIA, Vol. 42, Nos. 1-4 : pp. 81-90, 2000, lists Tamarix ramosissima in the plants of Nubra Valley. Moreover the images seem to agree with those of Tamarix ramosissima at POWO, as Garg ji pointed out.