N. Vietnam, Prov. Bac Can, limestone mountain pass Gio on car road from Hanoi to Cao Bang sity near Ngon Son town at 800-900 m alt. Secondary shrubs and grass communitys on high limestone massif. Epilitic herb on wet open shelfes of vertical limestone mesas bluffs at 700-800 m alt. near road. Tepals from pale green to pale pink with purple veins, lip with central brightly purple-violet spot on epichile. Rare. VH 4991 28.05.1997 International Botanical Expedition of the U.S.A. National Geographic Society (grant No 5803-96)