Numerical taxonomic study of some Ipomoea species (convolvulaceae) in anambra state, southeastern Nigeria
Chiedozie Joel UKA, Clement Uwabunkeonye Okeke, Bibian Okwuchukwu Aziagba
Numerical study was conducted on eight species of genus Ipomoea in Anambra State, Southeastern Nigeria based on morphological characters. This was done in order to better understand their interrelationship and aid its identification. The species are Ipomoea aquatica, I. asarifolia, I. quamoclit, I. involucrata, I. triloba, I. acanthocarpa, I. hederifolia and I. nil. They were gotten from the wild and authenticated in the herbarium where voucher specimens were deposited. Discrete characters were noted in the field while qualitative and quantitative characters were observed and measured in the laboratory. A total of 48 attributes comprising 31 qualitative and 17 quantitative characters were studied and coded for analysis. UPGMA (Unweighted Pair Group Method with Arithmetic Mean)and Jaccard similarity coefficient were carried out on the data in order to elucidate the relationship among the taxa, while dendrogram and their taxonomic keys were constructed. UPGMA tree derived from cluster analysis reveals three major clusters, cluster 1 to cluster 3 containing 3, 3 and 2 species respectively. Species within the same cluster had greater similarity than those in the other clusters. The results of this study therefore, confirmed and established previous works on this genus and provided an excellent statement on the relationship among these species. Thus showing the significance of numerical analysis for taxonomic relationship in the genus Ipomoea.