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. Terrestrial prostrate herb in open wet places. Flowers dull pale blue-lilac. Very common.
CBL 1713 28 April 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)