N. Vietnam, Prov. Cao Bang, Distr. Tra Linh, Subdistr. Quoc Toan, open dry evergreen eteleeria davidianaﰠforest on tops of remnant limestone mountains at 800-900 m alt. near Thang Heng lake in environs of Thang Hen and Lung Tao villages.
Epilite. Flowers white, rare pinkish, sidelobes of lip with purple strips. Abundant on top of ridges at 850-900 m alt.
VH 2479 04.01.1996
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 5094-93)
Participants: L. Averyanov, N.T. Ban, A. Budantzev, L. Budantzev, N.T. Hiep, D.D. Huyen, P.K. Loc, G. Yakovlev