Thanh Hoa Prov., Quan Son Distr., Na Meo Municipality, Ban Son vill., shale mountains, about 10 km to NW of Na Meo centre (around point 20°17′28″N 104°40′43″E, 300 m).
Scattered in heavily logged primary open mixte forests on slopes of shale mountains, 400-600 m. Terrestrial perennial herb, flowers white HAL 11205 24 Aug. 2007 Coll.: P.K. Loc, N.S. Khang & N.T.Vinh
Grant from MOST, Council for Natural Science, Section of Life Sciences (6.077.06), Vietnam