Anatomia da Folha e do Caule de Calea longifolia(Asteraceae)

SUMMARY. “Anatomy of leave and stem of Calea longifolia(Asteraceae)”. Several species of CaleaL. have been showed medicinal properties. Chemical studies have been confirmed the presence of biologically activity compounds in the taxa, although, few works focused the morphological aspects. This work aimed to analyse the morphological characters of the leaf and stem of Calea longifolia,in order to contribute for the species identification. The botanical material was prepared according to usual light and scanning microtechniques. The blade has uniseriate epidermis coated with thin and striate cuticle. Crypts, where anomocytic stomata and glandular trichomes occurs, are seen on the abaxial surface. Glandular trichomes are pluricellular and uniseriate, with 4-5 celled pedicel, or still, capitated. The mesophyll is isobilateral and the midrib is biconvex and traversed by a collateral vascular bundle. The stem shows circular transection and uniseriate epidermis, with pluricellular and acute non-glandular trichomes. Adjacent to the epidermis, lamelar chlorenchyma occurs. More internally, collenchyma becames lacunate. Radially elongated cells are observed in the cortex, perivascular fibres adjoin the to phloem, the cambial zone is evident and the pith consists of parenchymatic cells. The stem is fistulous. Secretory ducts are associated with the vascular system of the leaf and stem.