【摘要】 通过对三种水生植物营养器官的解剖观察发现这几种植物根的木质部不发达 ;茎中有发达的通气组织或中空 ;叶片薄或线形 ,等面叶 ,叶表皮中含叶绿体 ,2个种栅栏组织退化 .所有这些特征均与其水生环境中的水对植物体有支持力 ,水中缺少氧气 ,光照缺乏等因素有关更多还原

【Abstract】 It is discovered that the xylem of the roots are underdeveloped.There is either developed ventilate tissue or hollow in the stems.Thin or linear leaves,Equal-surface leaves and with chloroplast in leave cuticle.The railing tissues of two species are degenerated.All of these features are the results of water growing,lack of air and sunlight.更多还原