Thanh Hoa Prov., Thuong Xuan Distr., Bat Mot Municipality, Ban Duc vill., Xuan Lien Nature Reserve, limestone mountains, around point 20°01′14″N 104°57′46″E, 900-980 m.
In primary closed evergreen seasonal tropical broad-leaved submontane forests on ridges of mountains. Sometimes also on shle mountains.
Terrestrial. Flowers pale violet
HAL 11166 19 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