Secondary Xylem Anatomy of Root and Stem of Alstonia scholais, Bischhiofia javanica and Trewia nudiflora: The Characteristic Plant Species of Manu Fresh Water Swamp, Rishikesh, Dehradun (India)

The paper presents a comparative account of ischolar_main and shoot secondary xylem anatomy of Alostonia scholaris R. Br (Family: Apocynaceae), Bischofia javanica Blume and Trewia nudiflora Linn. (Family: Euphorbiaceae) of Manu swamp, Rishikesh, Dehradun (India). Fiber dimensions and vessel element diameter of secondary xylem of shoot were higher than that of ischolar_mains. Moreover, vessel and ray frequencies were higher in ischolar_mains whereas the size of inter vessel pits was more in shoots of all the three species. Further, parenchyma is diffuse in aggregate, scanty paratracheal and vesicentric in ischolar_mains and scanty paratracheal in shoots of A. scholoaris; diffuse, in aggregate and scanty paratracheal in shoot while only diffuse in ischolar_main of B. javanica, and diffuse, in aggregate and scanty paratracheal in shoot while scanty paratracheal in ischolar_main of T. nudiflora. Other anatomical features of ischolar_main and shoot anatomy of secondary xylem are more or less similar in A. scholaris, B. javanica and T. nudiflora.