N. Vietnam, prov. Cao Bang, distr. Nguyen Binh, municipality Ca Thanh, vicinities Ca Lu village, about 7-8 km to SE from Yen Lac village (N 22°44′ E 105°50′), about 38 km to NWW from Cao Bang town. Old wet broadleaved semideciduous primary forest on steep slopes of remnant limestone ridge at 1350 m alt. Epilite herb on vertical cliffs of shadow canyons. Flowers pink, leaves below purple veined, above deep green. Very common.
CBL 562 21 Nov. 1998
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)