EXPEDITION TO NORTHWESTERN CHINA AND NORTHEASTERN TIBET SOUTHWESTERN KANSU T'ao River basin: forests & meadows of Merku., west of Choni. Alt. 10000 ft.
Expedition to Northwestern China and Northeastern Tibet - 1924-1927 ; Lower Tebbu Country : Wantsang Valley, forming large groves but more often single trees observed in Valley floor of Tsaoshi Valley alt 8000 ft