国产嵩草属(莎草科)植物秆的解剖学研究

对嵩草属27种(亚种)植物秆的解剖学研究证明,嵩草属植物秆的解剖学性状具有系统学意义.在该属中,秆的横切面外形为三角形、圆三角形、圆形或扁圆形.在横切面上分为2个区域;外部区域包括绿色组织、外韧维管束和气腔,内部区域为薄壁组织或其碎裂形成空腔.秆表皮的横切面观和表面观均与叶的下表皮相似.以上特征与莎草科其它类群植物秆的解剖特征一致,不支持将嵩草属和其近缘属另立为嵩草科.同时,秆的解剖学特征可以做为某些在外部形态上难于区分的种之间的分类依据.

Culm anatomy of Kobresia (Cyperaceae) from China

The culms of 27 taxa in the genus Kobresia (Cyperaceae) were studied anatomically.The anatomical characters of culm in the genus are proved to be significant in systematics.The outline of culm transverse section may be triangular,rounded triangular, circular or flattened circular.The outer chlorenchymatous zone and the inner pith zone can be distinguished in transverse section of culm.The vascular bundles are collateral,and all embedded in the chlorenchymatous zone.The epidermis of culm is identical to the abaxial surface of leaf blades both in transverse section and in surface view.These characters are consistent with those of other genera in Cyperaceae;therefore,the culm anatomical data didn't support the establishment of Kobresiaceae.In addition,the culm anatomical characters could be used to classify morphologically similar species.