Lai Chau Prov., Tam Duong Distr., Ho Thau Community, Ho Thau village, around point 22°23′49″N 103°36′39″E.
Primary closed evergreen broad-leaved forest on steep mountain slopes and along ridges composed with granite and shale at elev. about 1900-2350 m a.s.l.
Terrestrial herb on very steep shady rocky slope. Flowers white, anthers violet. Not common.
HAL 10294 3 Dec. 2006 Photo. Coll.: Nguyen Tien Hiep, L.Averyanov, Pham Van The.