Contribution to the anatomy of Sagittaria sagittifolia L. (Alismataceae) RODICA BERCU Department of Botany, Faculty of Natural and Agriculture Sciences, “Ovidius”University, Mamaia 124, 900590, Constantza, Romania Abstract Anatomically, Sagittaria sagittifolia L. (arrowhead) exhibits characteristics of monocots with hydrophytic features in accordance to its aquatic habit. The root has a primary structure with a conductive stele and a cortical aerenchyma. The stele is well developed. The stem cortex is also aerenchymatic and is covered by an epidermis. The stele consists of a number of collateral bundles, each bearing of a few xylem and phloem elements. The leaf has a chlorenchymatic mesophyll with large air cavities. The upper and lower epidermises possess paracytic stomata. The leaf petiole cortex is aerenchymatic.    < back .