FLORA OF VIETNAM (NEW) Gentianaceae Cotylanthera zygomorpha Aver. et Khang., sp.nov. Type Nghe An Prov., Ky Son Distr., Na Ngoi Municipality, eastern slopes of Phu Xai Lai Leng Mountain. Primary very humid broad-leaved forest on steep mountain slopes composed of sandstone and gray shale at elevation 2000-2300 m a.s.l. around point 19°11’58.2’’N 104°11’38.6’’E. Terrestrial achlorophyllous white saprophyte in shady place along edge of ridge. Flowers white, anthers yellow. Very rare. 24 October 2013 CPC 6183 Coll.: L.Averyanov, N.T.Hiep, N.S.Khang, L.M.Tuan, N.A.Trang, L.H.Dan