N. Vietnam, prov. Cao Bang, distr. Bao Lac, municipality Yen Lac, vicinities of Yen Lac village (N 22°44′ E 105°50′). Secondary open broadleaved evergreen forest on steep slopes and bluffs of limestone remnant karst ridge at 1100 m elev. Lithophyte herb on open wet rocks. Flowers pale blue, tepals with yellowish spots. Not common.
CBL 1444 16 April 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)