[Leaf anatomy of four species of Solanum L. section Acanthophora Dunal in Venezuela].

Anatomical characteristics of S. acerifolium Dun., S. agrarium Sendtn., S. capsicoides All. and S. mammosum L., leaves were studied in order to recognize some useful features for its interspecific delimitation. 5 to 10 healthy fully expanded leaves, taken from the middle third of the plant, were examined in at least 3 different plants for each studied species. Samples were preserved in 70% FAA. Additionally, herbarium specimens (4-5 leaves/specimen) were hydrated in lactophenol and examined. The middle third of the foliar lamina and the petiole were prepared following the classical techniques used for anatomical studies. Clearing process of the foliar lamina was also made. The results show similar histological configuration in all studied species. Among the most remarkable features are: the type of leaf regarding to stomata location, number of petiole layers, angular collenchyma, petiole cross section shape and the type of vascular bundles. Finally, it is concluded that the anatomical study of the leaves of mentioned species is useful for its delimitation.