Son La Prov., Van Ho Distr., Chieng Xuan Municipality, Co Hong village, territory of Xuan Nha natural reserve, Pha Luong Mountain.
Remnants of primary and secondary broad-leaved evergreen forest on very steep mountain slopes composed by brown sandstone at elevation 700-1000 m a.s.l. around point 20°42′14.2″N 104°43′53.9″E.
Terrestrial tuberiferous herb among open secondary shrubs and short tall grasslands. Not common.
12 November 2013 CPC 6961a Coll.: L.Averyanov, N.T.Hiep, N.S.Khang, N.D.Thang, L.D.Qui Living specimen only.