N. Vietnam, prov. Cao Bang, distr. Bao Lac, municipality Ca Thanh, about 3 km to SW from Yen Lac village (N 22°44′ E 105°50′), about 42
km to NWW from Cao Bang town. Primary open coniferous mossy forest (with Pseudotsuga brevifolia in 1 stratum) along tops of limestone karst remnant ridge at 1400-1450 m alt. Creeping epiphyte vine up to 10 m lg. Flowers outside white with pinkish tepal tips, purple striped inside. Rare.
CBL 384 18 Nov. 1998
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)