Intraspecific Variation and Taxonomic Delimitation of <i>Munronia </i><i>p</i><i>innata</i> (Meliaceae) in Sri Lanka

Abstract

Munronia pinnata (Wall) The ob (Meliaceae) is a rare, therapeutically important medicinal plant used in traditional and folklore medicine in Sri Lanka. Available species/morphotypes/ecotypes of M. pinnata in different locations exhibit diverse range of variations suggesting the possible revision of current taxonomic status. Present study compares seventy different vegetative and reproductive morphological characters in order to suggest the possible taxonomic delimitation of 13 populations of M. pinnata available in Sri Lanka. A cluster analysis and a Principle Component analysis (PCA) were performed using average taxonomic distance. A single access (sequential), key to sub specific taxa was constructed using stable morphological characters. In the cluster, APRG - 5 populations (Population collected from Ritigala forest) has got separated from all the other populations at a distance of about 100%. Populations collected from the same geographical areas (Gampaha district GPPW - 3, GPWP - 3; Moneragala district MGMG - 9 MGWW - 7; Nuwara Eliya district NEKP - 3, NEMR - 3) have grouped closely either in the dendrogramme or in PCA or both. Based on the results, it could be concluded that population APRG - 5 is distantly related to all others and deserved placing as a sub specific taxon of M. pinnata. Further, populations collected from the same geographical area seem to be closely related with one another. Sequential key prepared using morphological characters could be used for the identification of M. pinnata populations even in the absence of flowers.