中国北部绣线菊属的花粉形态及分类学意义

本文用光学显微镜和扫描电镜观察了中国北部绣线菊属ＳｐｉｒａｅａＬ．２１种及６个变种的花粉形态，描述了外壁纹饰的形态特征，指出了外壁纹饰特征在分类上的意义。绣线菊属的花粉为球形至长球形，外壁纹饰为条网状至条纹状。外壁纹饰类型不具有属内分组意义，但对一些种类具有一定的分类价值。花粉形态支持将曲枣绣线菊Ｓ．ｆｌｅｘｕｏｓａＦｉｓｃｈ。并入石蚕叶绣线菊Ｓ．ｃｈａｍｏｅｄｒｙｆｏｌｉａＬ．的观点［Ｍａｘｉｍｏｗｉｃｚ，Ｃ．Ｊ．（１８７９）、Ｒｅｈｄｅｒ，Ａｉ．（１９４０）］，不同意将蒙古绣线菊毛枝变种Ｓ．ｍｏｎｇｏｌｉｃａＭａｘｉｍ．ｖａｒ．ｔｏｍｅｎｔｕｌｏｓａＹｕ提升为贺兰山绣线菊Ｓ．ｔｏｍｅｎｔｕｌｏｓａ（Ｙｕ）Ｙ．Ｚ．Ｚｈａｏ［赵一之（１９８７）］。

POLLEN MORPHOLOGICAL OBSERVATIONS OF THE GENUS SPIRAEA L. FROM THE NORTH OF CHINA AND ITS TAXONOMIC SIGNIFICANCE

The pollen morphology of 21 species and 6 varieties of the genus Spiraea L.from the North of China was investigated with aid of LM and SEM in this paper,The results showed that: The shapes of most pollen grains are spheroidal and prolate.Only a few are subspheroidal. Exine sculptures of pollen grains of this genus are from reticulate-striate to striate. Pollen morphological characters have little significance in section classification, but have important value for certain species. Based on pollen morphological characters we support C.J.Alaximowicz (1879) and A. Rehder (1940)treament which S. flexuosa Fisch.was redused to S.chamaedryfolia L.,and didn't agree with Zhao Yizhi treament which S.mongolica Yu was elevated to species rank S.tomentulosa (Yak)Y.Z.Zhao.