| Sumario: | Leaves of cultivated plants, alive or fixed, in paradermal and cross sections were studied. The determination of occupied area by epidermal cells, stomata and trichomes according to the stereological method was done. For this determination and the study of venation, whole clarified leaves were used. The structure of leaves is dorsiventral. The stomata are anomocytic. The trichomes area of the conical, filiform and glandular biseriate types. The venation is acrodromous. The vascular bundles have a collateral arrangement. Floem fibers are present. The minor veins have paranchymatic bundle sheat. Hydathodes occur at the apices of serrations on the margins of leaves. Schizogenous secretory canals, opposed to protoxylem, accompany the primary veins.
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