Thanh Hoa Prov., Thuong Xuan Distr., Van Xuan Municipality, Thac Lang vill., Bu Duc mountain, Xuan Lien Nature Reserve, shale on slopes, limestone on top ridges, around point 19°51′40″N 105°15′45″E, 700 m.
Scattered along limestone ridges, in completely logged primary open evergreen seasonal tropical broad-leaved submontane forests.
Perennial herb, terrestrial. HAL 11195a 22 Aug. 2007 Coll.: P.K. Loc, N.S. Khang, N.T.Vinh & L.V. Hung
Grant from MOST, Council for Natural Science, Section of Life Sciences (6.077.06), Vietnam