N. Vietnam, Prov. Cao Bang, distr. Tra Linh, municipalite Quoc Toan, vicinity of Thang Heng and Lung Tao villages near Thang Heng lake. Remnant closed evergreen primary broadleaved forest on steep slopes and bluffs of limestone ridges and mesas near karst lake at 500-650 m alt. Epiphytie on shadow rocky slopes and bluffs. Tepals light pink with yellow tint, lip and spur purple-violet, sidelobes yellow. Not common. VH 4860 25-27.05.1997 International Botanical Expedition of the U.S.A. National Geographic Society (grant No 5803-96)