%0 Journal Article
%T Comparative Leaf Anatomy of Nymphaeaceae (s. l.)<br>睡莲科叶比较解剖
%A Chen Wei-Pei
%A Zhang Si-Mei
%A <br>陈维培
%A 张四美
%J 中国科学院研究生院学报
%D 1992
%I 
%X Leaf anatomy of six genera was investigated. The petiole of Brasenia schreberi possesses a pair of bundles, the other five possess closed, scattered vascular bundles, resembling those of the Monocotyledons. True vessels are ab- sent. Air passages are present in the ground tissue of the petiole except for Nuphar pumilum. Leaves are all dorsiventral. Stomatal apparatuses of the Ranunculaceous type are generally confined to the upper surface of the  lamina,  but  fewer stomata are found on the lower surface of the lamina of Nelumbo nucifera. The stomatal apparatuses of Nelumbo nucifera are of the Haplocheilic type in develop- ment,  but  of  the Ranunculaceous  type  at  maturity.  Hydathodes  and sclerenchymatous idioblasts are present only in Nelumbo nucifera. Glandular hairs and hydropotens occur on the lower surface of the lamina in all the investigated species except Nelumbo nucifera. Astrosclereids are present in all the taxa except Brasenia schreberi and Nelumbo nucifera. According to observations we consider that the genus Brasenia is a primitive one in Nymphaeaceae and it has a close phylogenetic relationship with Cabomba. They may be treated as an independent family,  Cabombaceae,  which is better included  in  the  order Nymphaeales. Nymphaea, Nuphar, Euryale and Victoria are closely related to one another and should be retained in the family Nymphaeaceae. Nelumbo shows, specialized fea- tures distinct from those of the rest of the Nymphaeaceae. It should be segregatednot only as a distinct family but also as a distinct order, Nelumboales.
%K Nymphaeaceae
%K Leaf
%K Comparative anatomy<br>睡莲科
%K 叶
%K 比较解剖
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=B5EDD921F3D863E289B22F36E70174A7007B5F5E43D63598017D41BB67247657&cid=B47B31F6349F979B&jid=67CDFDECD959936E166E0F72DE972847&aid=57B25416EB140237241C5A5FC5F16820&yid=F53A2717BDB04D52&vid=340AC2BF8E7AB4FD&iid=94C357A881DFC066&sid=BFB86B6ED3A99B9D&eid=B941678158018439&journal_id=1002-1175&journal_name=中国科学院研究生院学报&referenced_num=0&reference_num=0