Taxonomic Evaluation of Fifteen Species of Ipomoea L. (Convolvulaceae) from South-Western Nigeria using Foliar Micromorphological Characters

Foliar micromorphological study was carried out on I. triloba, I. eriocarpa, I. alba, I. hederifolia, I. muricata, I. intrapilosa, I. asarifolia, I. batatas, I. aquatica, I. mauritiana, I. carnea, I.involucrata, I. nil, I. heterotricha and I. obscura to determine the patterns of variation in their epidermal characteristics and search for useful and stable anatomical characters for the identification of the species. Leaf epidermal features that provided useful specific distinctions are cell shape, anticlinal wall pattern, stomata shape, stomata type, trichome, cuticular striations, crystal, granular periclinal wall, stomata size, stomata index, scale and tannin. The characters revealed interrelationships among the Ipomoea species and also suggest their monophyly.