STRUCTURAL ANATOMICAL ASPECTS OF TWO EUPHORBIA (EUPHORBIACEAE JUSS.) SPECIES LEAVES

Abstract

The paper presents a study concerning the leaf structure (petiole, as the case) and blade of two Euphorbia species belonging to Euphorbiaceae family: Euphorbia trigona Mill., and E. tirucallli L. In literature is little information concerning the leaf petiole or blade anatomy of species of Euphorbia genus in general and concerning these two species in particular. The petiole of Euphorbia trigona possesses one epidermis cells which are more or less rounded in shape, covered by a thin cuticle. The vascular system of the petiole is represented by three closed–collateral vascular bundles. Anatomically, the leaves blade of the studied species are heterogenous and amphistomatic with lacticifers especially presented to the midrib zone, more abundant în Euphorbia tirucalli. The midrib vascular system is more developed in Euphorbia tirucalli than E. trigona.