Lai Chau Prov., Tam Duong Distr., Ho Thau Community, Ho Thau village, around point 22°23′05″N 103°36′46″E.
Secondary and primary evergreen closed forest on very steep mountain slopes composed with granite and quartzite at elevation from 1500 to 1900 m a.s.l.
Shrub 1.5-2.5 m tall along ridge edge. Flowers white with violet tint. Locally common.
HAL 10184 29 Nov. 2006 Coll.: Nguyen Tien Hiep, L.Averyanov, Pham Van The.