Flowers of Himalaya does not mention Youngia but its Supplement does have a description and photo of Youngia tenuifolia susbp. diversifolia – recorded from Pakistan to Central Nepal Tibet & Central Asia @ 3000-4600m. A perennial of Tibetan borderlands.
Stewart records this from Kashmir & Ladakh @ 3000-4600m with Stewart himself finding it in rock crevices at Sonamarg.
It was located in the Stok Valley, Ladakh by Maxwell during the 1976 Southampton University Ladakh Expedition.
Flora of Lahaul-Spiti records this as rare in rock-crevices at Tandi.