¹Istanbul University, Faculty of Pharmacy, Department of Pharmaceutical Botany, 34116 Beyazit, Istanbul, Turkey DOI : 10.12991/marupj.307971 Psoriasis is a chronic, noncommunicable inflammatory disease characterized by shiny, pearlescent-white scales embedded on papules and erythematous plaques. Because of the color of the squamouses, it is popularly known as "Psoriasis". In this study leaf anatomies of three plants (Juniperus oxycedrus L. (Cupressaceae), Aloe vera (L.) Burm.f. (Xanthorrhoeaceae), and Smilax excelsa L. (Smilacaceae) were investigated among the plants used in psoriasis in Turkey. In psoriasis, a fatty substance called juniper tar obtained from the branches of Juniperus oxycedrus, a gel stored in the parenchyma at the center of the leaf of the Aloe vera, and roots of the Smilax excelsa are used. Photographs of leaf cross-sections and superficial cross-sections of the three plants are presented. Stomatal index were calculated for the first time in this study. Keywords : Psoriasis, Juniperus, Aloe, Smilax, leaf anatomy, Turkey