石菖蒲与马蹄莲幼苗结构的解剖学研究

he controversy about the classification and systematic position of A corus L. has lasted for about two century. The study of comparative anatomy on the structure of seedlings of A corus tatarinow ii and Z an tedeschia aethiopica as presentation supp lies the evidence of the particular systematic posit ion of A corus L. from an aspect of the anatomical structure of seedling. The type of stele in lower cotyledon node zone(CN Z).A corus ta ta rinow ii was more primitive”工”-shape mesarchhaplo stele, while Z antedeschia aethiopica atactostele; the actinostele of root of the former was di-to octoarch , but the latter only di-to pentarch ; The pat tern of endothecial wall thickening in A . ta ta rinow ii was characteristic of five-face thickened and contained passage cell, while Z. aethiopica four-faced thickened and known as casparian strip. Endocyte of the former is styloids, otherwise the latter was typical raphides. In addition, there occurred difference in thestructure of co tyledonary haustrum and other storages. The results of this study supported removing Acorus from A raceae as a singular family and as the basal and relative isolation of the monocotyledon.