N. Vietnam, prov. Cao Bang, distr. Bao Lac, municipality Huy Giap, about 5 km to NW from Yen Lac village, 50 km to NWW from Cao Bang town (N 22°44′ E 105°50′). Secondary shrubs and bamboos on steep shale slopes at 1400 m alt. Herb vine up to 3-4 m lg in shadow place. Flowers light blue. Not common.
CBL 230 14 Nov. 1998
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)