小果青钱柳的分类地位

<正> 钟补求教授于1936年根据采自安徽黄山的模式标本而发表小果青钱柳Pterocarya mi-cropaliurus Tsoong新种时指出,该种与青钱柳的主要区别在于:(1)果实(包括果翅)较小,直径不超过2.5匣米,而在青钱柳则为3—7匣米;(2)果序较短,长约为青钱柳之半;(3)小叶数目较多,通常9—11枚,且较青钱柳为狭小;(4)小叶的锯齿较密较尖,最大的小叶通常每边有60个以上的锯齿,而在青钱柳则通常不到40个。但根据《中国植物志》第二十一卷(以下简称《植物志》),小果青钱柳应为青钱柳Cyclocarya paliurus(Batal.)Iljinsk.的异名。该《植物志》写道:“本种的小叶大小及数目、果翅的形状及大小变异极大,某些极端类型看来好象可以划分成各别的种,但都存在有中间类型,并且也无一定的地理分布限定,因此它必然是一个自然的种”。为此,我们对有关的腊叶材料进行了

THE TAXONOMIC STATUS OF PTEROCARYA MICROPALIURUS TSOONGTHE TAXONOMIC STATUS OF PTEROCARYA MICROPALIURUS TSOONG

Pterocaryo micropaliurus Tsoong was recently reduced by K.Z.Kuang and al.to be a synonym of Cyclocarya paliurus(Batal.)Iljinsk.in the "Flora Reipubli-cae Popularis Sinicae" volume 21,page 19,1979.A quantitative analysis of discriminating characters with a pictorialized scatter diagram(Fig.)on 69 herbarium sheets has been carried out with a view to reevaluate the identity of P.micropaliurus.The scatter diagram shows clearly that the two main diagnostic characters used by Tsoong to distinguish his new species from P.paliurus,namely,the number of teeth per either side of leaflet and the diameter of fruit,exhibit more or less a discontinuous variation pattern.Tsoong's third character,the number of leaflets,though overlaps to some extent in the two said taxa,tends to display a divergent variation pattern too.Thus,it seems advisable to consider P.micropaliurus Tsoong as taxonomically distinct from P.paliurus,and as a variety of the latter.The transfer and reduction of the species in question to the genus Cyclocarya Iljinsk.are made thereby.Pterocaryo micropaliurus Tsoong was recently reduced by K.Z.Kuang and al.to be a synonym of Cyclocarya paliurus(Batal.)Iljinsk.in the "Flora Reipubli-cae Popularis Sinicae" volume 21,page 19,1979.A quantitative analysis of discriminating characters with a pictorialized scatter diagram(Fig.)on 69 herbarium sheets has been carried out with a view to reevaluate the identity of P.micropaliurus.The scatter diagram shows clearly that the two main diagnostic characters used by Tsoong to distinguish his new species from P.paliurus,namely,the number of teeth per either side of leaflet and the diameter of fruit,exhibit more or less a discontinuous variation pattern.Tsoong's third character,the number of leaflets,though overlaps to some extent in the two said taxa,tends to display a divergent variation pattern too.Thus,it seems advisable to consider P.micropaliurus Tsoong as taxonomically distinct from P.paliurus,and as a variety of the latter.The transfer and reduction of the species in question to the genus Cyclocarya Iljinsk.are made thereby.