FLORA OF VIETNAM Begoniaceae Begonia khangii sp.nov.? 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 2100-2200 m a.s.l. around point 19°11’59.3’’N 104°11’23.9’’E. Lithophytic herb on mossy rocks. Flowers pink, anthers and stigmas yellow. Leaves below with dull dirty purple spots. Very common. 25 October 2013 CPC 6281 Coll.: L.Averyanov, N.T.Hiep, N.S.Khang, L.M.Tuan, N.A.Trang, L.H.Dan