从种子和叶片特征论高山三尖杉(Cephalotaxus alpina(Li)L.K.Fu)的分类地位(三尖杉科)

长期以来，对高山三尖杉（Cephalotaxus alpina(Li) L.K.Fu）分类地位的争议缺少可靠证据。本文从居群采样的水平上比较了高山三尖杉和三尖杉（Cephalotaxus fortunei Hooker）的叶片和种子形态特征，两者除种子的长宽比率无显著差异外，种子长度，宽度，厚度，长厚比率，宽厚比率以及叶片长度和宽度均差异极显著。此外，通过散点图分析表明两者的种子宽厚比和叶片宽度的变异是间断而稳定的，这一特征能将高山三尖杉和三尖杉明显地区分，结果支持将高山三尖杉作为种的等级较为合适，不赞成将高山三尖杉作为三尖杉的变种或亚种的分类处理。同时，对标本和原始文献的研究认为胡秀英(1964)发表的园桃杉（Cephalotaxus fortunei Hooker var. globosa S.Y.Hu）和高山三尖杉应是同一分类群。

Taxonomic Status of Cephalotaxus alpina(Li) L.K.Fu(Cephalotaxaceae) in the Views of Morphological Characteristics of Seeds and Leaves

The significant differences in length,width,thickness,length/thickness ratio,and width/thickness ratio of seeds,as well as in length and width of leaves between Cephalotaxus alpina(Li) L.K.Fu and Cephalotaxus fortunei Hooker were shown in this study.The width range and mean of leaf of C.fortunei Hooker are 3.50-6.20cm and 5.02cm,respectively.In contrast,C.alpina(Li) L.K.Fu has only 2.00-3.50cm and 2.89cm.The range of seed width/thickness ratio and mean of C.fortunei Hooker are 0.53 and 1.43,respectively,while C.alpina(Li) L.K.Fu is 0.23 and 1.02,respectively.Scatter diagrams of C.alpina(Li) L.K.Fu and C.fortunei Hooker illustrated that the variations in leaves length,seeds length,seeds width,seeds thickness,seeds length/width ratio and seeds length/thickness ratio between these two taxa can not differ C.alpina(Li) L.K.Fu from C.fortunei Hooker,but the variation in leaves width and seeds width/thickness ratio can differ C.alpina(Li) L.K.Fu from C.fortunei Hooker notably.Based on these significant differences,we supported the view that Fu(1984) treated C.fortunei Hooker var.alpina H.L.Li as C.alpina(Li) L.K.Fu,and disagreed with the argument that Silba(2007) thought C.fortunei Hooker var.alpina Li as C.fortunei Hooker subsp.alpina(Li) Silba.On the other hand,there were evidences supporting that C.fortunei Hooker var.globosa S.Y.Hu(1964) should be the same taxon with C.alpina(Li) L.K.Fu.Finally,a new plates 1-6 was provided.