N. Vietnam, prov. Cao Bang, distr. Bao Lac, municipality Dinh Phung, about 5 km to NW from Yen Lac village (N 22°44′ E 105°50′), about 50 km to NWW from Cao Bang town. Old secondary closed broadleaved wet cloud forest on steep slopes and cliffs along top of Nam Linh limestone ridge at 1500-1580 m alt. Terrestrial and epilite herb. Leaves light green, violet veined. Rare.
CBL 492 19 Nov. 1998
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)