FLORA OF VIETNAM Plants of Phong Nha - Ke Bang National Park Fam. Pentaphragmaceae Pentaphragma sp. Vietnam, Quang Binh Prov., Minh Hoa Distr., Thuong Hoa Municipality, about 1 km to N of Ban On village (17º40'21''N, 105º58'00E). Logged primary closed evergreen broad-leaved lowland forest along stream and foothills of rocky ridge composed with solid marble-like highly eroded crystalline limestone at elevation 340-400 m a.s.l. Terrestrial herb on steep slope. Flowers dull pinkish-violet. Rare. No HAL 5929 19 January 2005. Collectors: L.Averyanov, P.K.Loc, P.V.The, A.Averyanova, N.T.Vinh, N.Q.Vinh, N.T.Binh.