FLORA OF VIETNAM Orchidaceae Hemipilia calophylla Par. et Rchb.f.
N. Vietnam, Prov. Cao Bang, distr. Tra Linh, municipalite Quoc Toan, vicinity of Thang Heng and Lung Tao villages near Thang Heng lake. Open dry primary mixed forest with domination of Keteleeria fortunei on tops of limestone mesas and ridges at 800-950 m alt.
Epilitic herb in crevices of open vertical limestone bluffs Leaves pale green with small numerous purple marks. Not rare. VH 4922 25-27.05.1997
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 5803-96)