N. Vietnam, prov. Ha Giang, distr. Meo Vac, municipality Sung Chang, vicinities of Lu Lu Phin village (N 23°11′ E 105°18′). Primary mixed mossy semideciduous open forest (with domination of Pseudotsuga brevifolia and Tsuga chinensis) along tops of karst remnant limestone ridge at 1350-1450 m elev. Terrestrial and lithophyte herb on steep slopes and vertical cliffs. Flowers deep blue. Very common. Codominanthe of lithophytic herb communities.
CBL 1826 29 April 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)