1 . the study of comparative anatomy on the structure of seedlings of acorus tatarinowii and zantedeschia aethiopica suggested a . tatarinowii was more primitive " x " - shape mesarch haplostele , while z aethiopica atactostele ; the actinostele of root of the former was di - to octoarch , but the latter only di - to pentarch ; the pattern of endothecial wall thickening in a . tatarinowii was characteristic of five - face thickened and contained passage cell , while z . aethiopica four - faced thickened and known as casparian strip 通过对石菖蒲和马蹄莲幼苗结构的比较解剖学研究，发现石菖蒲幼苗的子叶节区下部为原始的中始式二原型的“工”字形的单中柱，而马蹄莲为散生中柱；石菖蒲根的维管柱为2 - 8原型星状中柱，马蹄莲为2 - 5原型星状中柱。石菖蒲根的内皮层细胞壁为马蹄形五面加厚；而马蹄莲为凯氏带四面加厚。
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