N. Vietnam, prov. Cao Bang, distr. Bao Lac, municipality Yen Lac, vicinities of Yen Lac village (N 22°44′ E 105°50′). Secondary short tall grasslands on alluvial shale foothills of karst remnant limestone ridges at 1100 m elev. Flowers lilac. Not common.
CBL 1584 20 April 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)