N. Vietnam, Prov. Hoa Binh, Distr. Mai Chau, subdistr. Pa Co, near 3 km to NE of Pa Co village. Primary evergreen mountain forest on cliffs of limestone ridge at 1100 m alt.
Epilite on vertical limestone cliff. Flowers light green. Common.
VH 2436 27.12.1995
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