Lai Chau Prov., Tam Duong Distr., Ho Thau Community, Ho Thau village, around point 22°24′19″N 103°36′42″E.
Primary closed evergreen broad-leaved wet cloudy ericaceous forest on very steep mountain slopes and on tops of ridge composed predominantly with shale at elev. about 2300-2500 m a.s.l.
Undershrub 1-2.5 m tall on very steep mossy rocky slope along streamlet. Flowers blue. Very common. Usual dominant of herbaceous stratum.
HAL 10473 7 Dec. 2006 Photo. Coll.: Nguyen Tien Hiep, L.Averyanov, Pham Van The.