The article is a part of a complex study on the anatomy of aquarium plants and comprises investigation of the root, stem and leaf anatomy of a perennial creeping herb Bacopa caroliniana (Walt.) Robins. The anatomical characteristics of Echinodorus cordifolius vegetative organs has been described and discussed. The root has a typical primary structure. The stem cortex is an aerenchyma and the centrally located vascular system is poor developed related to the cortex. The sessile semi-submersed leaves epidermis possess stomata. The mesophyll is represented by a spongy tissue. In the mesophyll are embedded few poor developed vascular bundles. In the literature a study into the anatomy of this species almost lack, excepting some systematic studies.