N. Vietnam, prov. Cao Bang, distr. Bao Lac, municipality Dinh Phung, Nam Linh mt. (N 22°47′ E 105°49′). Secondary mossy short tall grasslands among limestone rocks on shale alluvial foothills of karst limestone Nam Linh ridge at 1450-1500 m alt. Prostrate herb. Flowers blue. Very common.
CBL 1381 15 April 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)