Correctly identified but nomenclatural/taxonomic change. For some time this and E.angustifolium have been transferred to another genus in the Onagraceae family.
This is now (according to most sources) Chamerion latifolium. The genus Chamerion is separated from Epilobium (most willowherbs in the Himalaya remain in Epilobium) on the basis of all leaves being alternate, flowers held horizontally, slightly zygomorphic, Whereas in Epilobium at least the lowest leaves are opposite, flowers +/- erect when open. The change of genus is accepted by senior British botanists.
This species is gregarious by alpine watercourses in Kashmir & Ladakh @ 2750-4850m. I have seen it in Ladakh, Lahoul & Kinnaur. In local Tibetan languages it is known as the 'Glacial Stream Flower' (Gangchhumentok); Koelz observes grows best on gravel flats in cold streams. Flowers of Himalaya record it from Afghanistan to Central Nepal. N.Asia and N.America. I have seen it in Alaska. They say screes and damp places @ 3600-4500m. Flora of Lahaul-Spiti say frequent on slopes; one of the most attractive herbs of the glacial zone.