N. Vietnam, prov. Cao Bang, distr. Bao Lac, municipality Dinh Phung, Man Lung ridge (N 22°47′ E 105°49′). Primary very wet cloud evergreen closed mixed forest (with Podocarpus and Fokienia) along tops of remnant karst limestone Man Lung ridge at 1550-1600 m elev. Lithophyte herb on vertical shady bluffs. Very common. Leaves from below purple-violet.
CBL 1531 18 April 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)