N. Viet Nam. Ha Giang Province, Quang Ba District, Bat Dai Son village. Primary forest on limestone with Quercus, Pseudotsuga and Podocarpus along Chung Ti Tei ridge at elev. 1100-1260 m, 28°08′11″N, 105°00′48″E. Epiphyte among mosses. Peduncle red, buds green. Rare.