Abstract

• The present paper deals with leaf architectural study on 6 species belonging to 6 genera and 6 families of Angiosperms from Mohnyin Township, Kachin State. The characters studied include leaf attachment, leaf arrangement, leaf organization, laminar shape, base and apex shape, base and apex angle, margin type, leaf texture, petiole features, laminar size classes, 1°, 2°, 3°, 4° and 5° vein category, spacing, angle and areolation. In this study, the leaves were compound in 2 species and simple in 4 species. Symmetrical leaf base and petiole base pulvinate was the characteristic of Phyllodium vestitum Benth. Leaf margin of all species were entire, sinuous, erose and dentate. The texture of leaf was coriaceous in 5 species and membranous in 1 species. In the present research work, three types of laminar size classes (mesophyll in 3 species, macrophyll in 1 species, and notophyll in 2 species) were recorded. Primary vein category were pinnate in 4 species and palmate in 2 species. Secondary vein category were hemieucamptodromous in 1 species, cladodromous in 1 species, brochidodromous in 1 species, festooned semicraspedodromous in 1 species, and eucamptodromous becoming brochidodromous in 2 species. Intersecondary vein was present in 3 species and absent in 3 species. Tertiary vein category were irregular reticulate anastomose in 2 species, transverse freely ramified in 1 species, composite admedial reticulate in 1 species, mixed alternate and opposite percurrent in 1 species, and opposite percurrent in 1 species. Marginal ultimate venation were looped in 5 species and spiked in 1 species. A dichotomous key for the species were constructed. These resulting data showed unifying and distinguishing diagnostic characters that are good taxonomic markers for the identification and classification of flowering plants, especially in dealing with sterile plant specimens.