FLORA OF VIETNAM. Pellionia rhizomatosa Gagnep. N. Vietnam, Prov. Quang Binh, distr. Minh Hoa, 72 km to NWW . from Dong Hoi, municipalite Thong Hoa, vicinities of Yen Son village, limestone massif Ke Bang (N 17°40' E 105°57'). Primary evergreen closed broadleaved forest on steep slopes and bluffs of limestone mesas. at 300-400 m alt. Epilitic herb with pendant shoots up to 0.6 m lg on limestone vertical. bluffs. Not rare, especially near top of mesas. No VH 4646  16.05.1997. International Botanical Expedition of the U.S.A. National Geographic. Society (grant No 5803-96). . Collectors: L. Averyanov, N.T. Hiep, P.K. Loc