Lai Chau Prov., Phong Tho Distr., Sin Suoi Ho Municipality, Sa Ma Pho village, around point 22°32′17″N 103°32′41″E.
Secondary open evergreen broad-leaved dry forest and secondary woodlands on very steep mountain slopes composed predominantly with weathered granite at elev. about 1200-1400 m a.s.l.
Climbing shrub on steep open slope along stream. Flowers white. Very common.
HAL 10797 15 Dec. 2006 Coll.: Nguyen Tien Hiep, L.Averyanov, Phan Ke Loc, Pham Van The, N.T.Vinh.