Abstract: The somatic chromosome numbers of 8 taxa of Begonia from Yunnan, China are reported: Begonia cabaleriei Levl. 2n=30; B.ceratocarpa S.H.Huang et Shui 2n=20; B.hemsleyana J.D.Hooker 2n=20; B.longicarpa K.Y.Guan et D.K.Tian 2n=20; B.palmata var. browingiana (Champ. ex Benth.)J.Golding et C.Kareg.2n=22;B.rex Putz.2n=22;B.silletensis subsp.mengrangensis M.C.Tebbitt et K.Y.Guan 2n=22 ();Bversicolor Irmscher 2n=22.Their chromosome numbers are reported here for the first time except those of B.hemsleyana, B.rex and B.versicolor.

Key words: Begonia