Lai Chau Prov., Muong Te Distr., around point 22°07′56″N 102°56′43″E.
Riparian shrubs on rocky steep slopes and bluffs composed with shale limestone along Song Da River valley from Muong Te to Muong Lay at elev. about 225 m a.s.l.
Lithophytic herb on open mother rocks and bluffs. Flowers light purple-violet. Not rare.
HAL 10135 25 Nov. 2006 Coll.: Nguyen Tien Hiep, L.Averyanov, Pham Van The.