萍蓬草〔Nuphar pumilum(Thimm.)DC.〕营养器官的形态解剖观察

对萍蓬草〔Ｎｕｐｈａｒｐｕｍｉｌｕｍ（Ｔｈｉｍｍ．）ＤＣ．〕根、茎、叶的形态结构和腺毛的发育进行形态解剖观察分析。茎中维管束散生、无形成层。茎端周围及幼叶、叶柄部位着生能分泌粘液的腺毛。不定根为多元型，有髓；侧根对着原生木质部脊着生，根表面具短缩的根毛；根顶端原始细胞具有分层特征，属封闭型。

Morphological and anatomical observations of vegetative organ of Nuphar pumilum (Thimm.) DC.

The morphology and anatomical structures of the root, stem and leaf, and the development of glandular hair of Nuphar pumilum (Thimm.) DC. are observed. The stem possesses scattered vascular bundles, and cambium is absent. The glandular hairs bearing the function of mucilage secretion exist on the young laminae, leaf stalks and around the top of stem. The adventitious root is polyarch with pith and lateral root arises opposite to the proxylem ridge; the short root hairs originate from the root epidermis. The vascular cylinder, cortex, and rootcap are traceable to independent layers of initial cells in the apical meristem of the root, thus the root is a closed type of apical organization.