FLORA OF VIETNAM Plants of Phong Nha - Ke Bang National Park Fam. Orchidaceae Appendicula hexandra (Koenig) J.J.Smith ? Vietnam, Quang Binh Prov., Minh Hoa Distr., Thuong Hoa Municipality, about 2 km to E of Ban On village (17º40'21''N, 105º58'00E). Heavily logged primary and secondary closed evergreen broad-leaved forest and scrub on rocky ridge composed with solid and stratified marble-like highly eroded crystalline limestone at elevation 550-650 m a.s.l. Epiphyte (on Phyllanthus sp., Pistacia cucphuongensis, Memecylon sp., Quercus sp., Allospondias lakonensis, Choerospondias axillaris, Pterospermum spp.) and lithophyte on shady slope of N exposition. Locally common. No HAL 5848 18 January 2005. Collectors: L.Averyanov, P.K.Loc, P.V.The, A.Averyanova, N.T.Vinh, N.Q.Vinh, N.T.Binh.