N. Vietnam, prov. Cao Bang, distr. Nguyen Binh, municipality Ca Thanh, vicinities of Ta Phinh village (N 22°44′ E 105°50′). Primary closed evergreen broadleaved forest on steep slopes and bluffs of remnant karst limestone ridge at 1200-1300 m elev. Terrestrial herb up to 1 m hg in shady places. Leaves from below light pinkish-violet. Not common.
CBL 1548 19 April 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)