Lai Chau Prov., Tam Duong Distr., Ho Thau Community, Ho Thau village, around point 22°25′20″N 103°36′13″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 2600-2700 (according to GPS navigation system 3032 m) m a.s.l.
Terrestrial herb on vertical mossy cliffs near the ridge top. Flowers blue. Rare.
HAL 10430 7 Dec. 2006 Coll.: Nguyen Tien Hiep, L.Averyanov, Pham Van The.