N. Vietnam, prov. Cao Bang, distr. Ha Lang, municipality Thang Loi, vicinities of Lung Sam village (N 22°45′ E 106°42′). Secondary wet evergreen broadleaved forest with remnants of primary elements on steep slopes and bluffs of karst remnant limestone ridge at 550-600 m elev. Terrestrial and lithophyte herb up to 1.5 m hg in shady places. Young inflorescences in fl. buds pinkish. Not common.
CBL 1671 24 April 1999 International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)