星果泻属的果实形态特征及其分类学意义

中国科学院大学学报

星果泻属的果实形态特征及其分类学意义

王青锋, 张志耘, 陈家宽

收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:1997-09-10 发布日期:1997-09-10
通讯作者: 王青锋

Morphological Characters of Fruits in Damasonium (Alismataceae) and Its Taxonomic Significance

Wang Qing-feng, Zhang Zhi-yun, Chen Jia-kuan

Received:1900-01-01 Revised:1900-01-01 Online:1997-09-10 Published:1997-09-10
Contact: Wang Qing-feng

摘要/Abstract

摘要：

利用解剖镜和扫描电子显微镜详细观察了泽泻科星果泻属全部5种植物的果实形态和微形态特征，发现该属植物的果实：常为蓇葖果具2～6枚种子；稀瘦果具1枚种子，扁压，不规则长方形，顶端一侧延伸成尾状长喙；或果实三角形，喙不明显。果皮上有角质层覆盖，角质层的纹饰为条状或细条状，上面密被碎屑状、颗粒状或稀疏的颗粒状蜡质附属物。这些特征可作为属下分类的依据。本文在前人研究的基础上对该属的分类进行了讨论并写出新的分种检索表。笔者认为将星果泻和星状星果泻各自作为独立的种可能更为合理；加州星果泻仍应放在星果泻属内，而星果泻则可能是加州星果泻与该属其它种联系的一个中间过渡类型；多籽星果泻不宜与星果泻全并，仍应保留为一独立的种。笔者还首次发现该属植物的果皮上分布有气孔。

关键词: 星果泻属, 果实, 形态特征, 微形态特征, 分类学意义

Abstract:

Macromorphological and micromorphological characters of fruits in the genus Damasonium (Alismataceae), comprising five species, were examined by stereoscope and scanning electron microscope(SEM). We found that the fruits of this genus are usually follicles with 2～6 seeds, rarely achenes with a single seed, compressed, irregularly rectangular with long-beaks at apex, or triangulate with indistinct beaks, carpodermis covered by cuticle

which is again covered densely with fragmentary or granulate waxy appendage. These characters, in authors’ opinions, are of some taxonomic significance in this genus. Combined with the other characters of this genus, we consider that the treatment of D. alisma and D. stellatum as two separate species is reasonable; D. californicum is still a member in the genus Damasonium, and D. polyspermum with some special characters is different from D. alisma. A key to the species of Damasonium is given in this paper. Stomata on the carpodermis in Damasonium, which are unique in the Alismataceae, are first reported.

Key words: Damasonium, Fruit, Macromorphology, Micromorphology, Taxonomic significance

王青锋, 张志耘, 陈家宽. 星果泻属的果实形态特征及其分类学意义[J]. 中国科学院大学学报.

Wang Qing-feng, Zhang Zhi-yun, Chen Jia-kuan. Morphological Characters of Fruits in Damasonium (Alismataceae) and Its Taxonomic Significance[J]. .

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