摘要篇首： 树生秋海棠新种 (秋海棠组) 图1Begonia arboreta Y.M.Shui,sp.nov.[Sect.Diploclium(Wight)A.D C.]Fig.1Habitu B.garretii Craib.similis,sed planta acaulis,folio 1 basali,capsulis obovoideis,alis obovatis differt.Herba perennis,decidua,basi tuberifera,tuberibus subglobosis,1cm diam.Stipulae caducae.Folium 1 basale;lamina glabra et chartacea,late cordata,14-15cm longa ,14-17cm lata,3-5-fida,basi oblique cordata,lobis longo-acuminatis,margine I rregulariter serratis,nervis palmatis,basilaribus 3-5;petioli 12-14cm longi,gl abri.Cymae terminales,3-4-florae,pedunculo 10-12cm longo;bracteae ovatae,0.6 cm longae,0.2cm latae,caducae.Flores ignoti;pedicelli 3.0-3.3cm longi,p enduli.Ovarium anguste obovoideum,triloculare;styli 3,distincti,1.5mm longi,s tigmatibus lunatis papillosis;laminae placentarum ovariorum superiores mediaeque bifidae,inferiores simplices.Capsulae obovoideae,2.0-2.4cm longae,1.2-1.4 cm latae,subaequaliter trialatae;alae horizontales et obovatae,apice obtusae,r eticulatae,1.8-2.0cm longae,0.5-0.6cm latae.Yunnan(云南):Luchun county(绿春县),Mt.Huanglianshan(黄连山),Hydrologic Station( 水文站),1700-1900m,on trees of the evergreen broad-leaved forest,18 Oct 1995, S.G.Wu(武素功),Y.M.Shui(税玉民),Y.P.Yang(杨永平),L.H.Liu(刘伦辉),J.H.He(何疆海), J.Murata,H.Nagamasu,T.Sugawara,X.Chen(成晓),N.Murakami 144(Holotype:KUN 0773200) .