Echinodorus macrophyllus (Kunth) Micheli - Alismataceae, known as "chapéu-de-couro", "chá-mineiro", "erva-de-pântano", "erva-de-bugre", "congonha-do-brejo", "erva-do-brejo", occurs in Minas Gerais and São Paulo. Although it has therapeutic and commercial importance and is described in the two first editions of the Brazilian Pharmacopoeia (1924, 1959), there are few studies that contemplate it. This present work had the objective to study the leaf and petiole morpho-anatomy of A. macrophyllus, in order to extend its pharmacognosy knowledge, aiming at the quality control. The macroscopic description was carried through disarmed sight, with optical resources and the dimensions with a caliper. The anatomical c haracteristics had been determined, after the harvest, in the fragments of leaves and fixed petioles, freehand sectioned and stained either in glycerin, astra-blue or fuchsine. The morpho-anatomical study of the leaf and petiole of A. macrophyllust contributed to extend and deepen the information contained in the Brazilian Pharmacopoeia (1924, 1959). The designated structural characteristics assist in the identification of the species and supply parameters that could be applied in the pharmacognosy quality control in the future. And, the presence of non-glandular trichomes in the midribs (adaxial and abaxial surface) and the petiole exhibits diaphragm (specialized cells), key structures in the diagnosis of the species, that are not described in the Brazilian Pharmacopoeia (1924, 1959), were inserted in the context of the anatomical description.
Echinodorus macrophyllus; Alismataceae; morpho-anatomy