七筋姑属种皮形态特征的研究

用扫描电镜对七筋姑属北美全部４个种和东亚七筋姑不同产地的１１个居群进行了种皮微形态特征的观察和研究，结果表明，北美４种中，Ｃｌｉｎｔｏｎｉａ ｕｍｂｅｌｌｕｌａｔａ以其种皮近于平滑、表面分布有大小不等的凹坑而不同于其它各种具条纹状或网穴状的表皮纹饰。北美西部的２个种Ｃ．ｕｎｉｆｌｏｒａ和Ｃ．ａｎｄｒｅｗｓｉａｎａ种皮纹饰相似，关系密切；而北美东部的Ｃ．ｂｏｒｅａｌｉｓ与东亚种Ｃ．ｕｄｅｎｓｉｓ长白

MORPHOLOGICAL FEATURES OF SEED SURFACES IN THE GENUS CLINTONIA RAF. (LILIACEAE)

The observation of morphological features of seed surfaces in the genus Clinionia. including those of all 4 North American species and 11 populations of EasternAsian species (i. e. C. udensis),has been carried out by SEa. The results show that C.umbellulata differs in having more or less a smooth seedsurface with concave cratersfrom others in having striated ornamentation of seed surfaces. C. uniNra and C. andrewsiana,both from western North America,are related to each other by having similarseed ornamentations,while C. borealis, which is from eastern North America,has similarseed surface ornamentation to that of Changbalshan population of C. udensis. About 4 ornamentation types of seed surfaces in 11 populations of C. udensis can be identified byour results, with reference to the correlation between ornamentation variation and infraspecific differentiation,especially to that of diploid and tetraplold populations. It is apparent that the morphological features of seed surfaces may have some taxonomical significance at species level, while in C. udensis, population variation (including variationbetween seed surfaces)may reveal that the species is now in a stage of strong differentiation.