Lai Chau Prov., Sinh Ho Distr., Nam Ban Community, around point 22°20′41″N 103°10′07″E.
Riparian shrubs on rocky steep slopes and bluffs composed with shale limestone along Nam Na River valley from Muong Lay to Phong Tho at elev. about 225 m a.s.l.
Terrestrial and lithophytic undershrub up to 1 m tall on shady very steep rocky slope and river bluffs. Flowers white, tepals with purple tips. Locally common.
HAL 10141 26 Nov. 2006 Coll.: Nguyen Tien Hiep, L.Averyanov, Pham Van The.