N. Vietnam, prov. Ha Giang, distr. Dong Van, municipality Ho Quang Phin, vicinities of Ta Xa village, 14-16 km to SSW of Dong Van town (N 23°16′ E 105°22′). Primary very wet mossy cloud mixed forest (with domination of Tsuga chinensis and Pinus kwangtungensis) along tops of karst remnant limestone ridge at 1550-1600 m elev. Terrestrial and lithophyte herb up to 0.4 m hg. Flowers greenish. Very common. Dominant of herb forest stratum in wet mossy places.
CBL 1761 28 April 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)