N. Vietnam, prov. Cao Bang, distr. Thach An, about 28 km to SE from Cao Bang town (N 22°29′ E 106°28). Primary evergreen broadleaved closed wet forest along deep shadow canyon of remnant limestone ridge at 300-400 m alt. Epilite and terrestrial herb on steep shadow slopes. Very common. Usual dominante of herb forest stratum.
CBL 947 06 Dec. 1998
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)