Lai Chau Prov., Tam Duong Distr., Ho Thau Community, Ho Thau village, around point 22°24′34″N 103°36′23″E.
Primary closed evergreen broad-leaved cloudy ericaceous forest on wet flat rocky river valley composed predominantly with shale at elev. about 2500 m a.s.l.
Terrestrial undershrub up to 1 m tall on shady rocky slope. Flowers pink-purple, anthers yellow. Locally abundant.
HAL 10410 5 Dec. 2006 Coll.: Nguyen Tien Hiep, L.Averyanov, Pham Van The.