Lai Chau Prov., Phong Tho Distr., Sin Suoi Ho Municipality, Sa Ma Pho village, around point 22°32′26″N 103°32′05″E.
Secondary open evergreen broad-leaved forest and secondary woodlands on very steep mountain slopes along rocky stream valley composed predominantly with weathered granite at elev. about 1000-1100 m a.s.l.
Terrestrial herb up to 1 m tall on open grassy steep slopes along rocky stream valley. Flowers white. Not common.
HAL 10729 13 Dec. 2006 Coll.: Nguyen Tien Hiep, L.Averyanov, Phan Ke Loc, Pham Van The, N.T.Vinh.