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′). Open secondary shrubs among limestone rocks on alluvial limestone ridge foothills at 1300 m alt. Creeping lithophyte herb on open rocks. Leaves purple, from above with 2 longitudinal silver-white stripes. Flowers purple-violet. Abundant on open rock outcrops all over the area at 1200-1300 m elev.
CBL 1717 28 April 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)