N. Vietnam, prov. Cao Bang, distr. Bao Lac, municipality Dinh Phung, Nam Linh mt. (N 22°47′ E 105°49′). Old secondary broadleaved wet mossy cloud forest along tops of remnant karst limestone Nam Linh ridge at 1550-1600 m alt. Epiphyte and lithophyte herb on open wet mossy vertical cliffs. Flowers pale greenish or white. Very common.
CBL 1395 15 April 1999 International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)