Comparative anatomical aspects of Euphorbia milli var. splendens (Bojer ex Hook.) Ursch & Leandri and Euphorbia pulcherrima Willd. ex Klotzsch species leaves
Journal Title: Annals of West University of Timisoara, ser. Biology - Year 2016, Vol 19, Issue 2
Abstract
The paper presents a comparative study concerning the leaf structure of two Euphorbia species belonging to Euphorbiaceae family: Euphorbia milli var. splendens (Bojer ex Hook.) Ursch & Leandri and Euphorbia pulcherrima Willd. ex Klotzsch. Anatomically, the leaves of the studied species are quite similar in the basic structure. The petiole has a single-layered epidermis, a collenchyma tissue – hypodermis - and three collateral bundles embedded in a basic tissue. Differences occur concerning the relationship between the collateral bundles. The Euphorbia pulcherrima bract petiole has almost the same structure as those of the leaf petiole. The blade is amphistomatic for Euphorbia milli var. splendes and hipostomatic for E. pulcherrima. The heterogeneous mesophyll is isobilateral in Euphorbia milli var. splendens blade and bifacial in E. pulcherrima. The vascular system of the mid rib is represented by one collateral bundle for both species, more developed in Euphorbia milli var. splendens blade. Differences appear concerning the epidermal cells cuticle thickness, the type of mesophyll, the abundance of the non-articulated laticifers and the development of the vascular system. The Euphorbia pulcherrima bract has the same organization plan structure as the leaf blade but some features differences occur.
Authors and Affiliations
Rodica BERCU
Keywords
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