Lai Chau Prov., Phong Tho Distr., Sin Suoi Ho Municipality, Sa Ma Pho village, around point 22°32′53″N 103°33′40″E.
Secondary open evergreen broad-leaved forest and secondary woodlands on very steep mountain slopes composed predominantly with weathered granite at elev. about 1600-1800 m a.s.l.
Terrestrial and lithophytic herb up to 1.5 m tall on very steep rocky slope. Flowers white. Locally very common.
HAL 10586 12 Dec. 2006 Photo. Coll.: Nguyen Tien Hiep, L.Averyanov, Phan Ke Loc, Pham Van The, N.T.Vinh.