Abstract

This study addresses the morphological similarities and taxonomic complexity of the genus Tarenaya Raf. of the family Cleomaceae Bercht. & J. Presl as well as the medicinal use of their species. The research compares potential anatomical diagnostic characters of the vegetative organs of species Tarenaya aculeata, Tarenaya diffusa, and Tarenaya spinosa to determine authenticity parameters. The study also carried out histochemical and phytochemical analyses of leaf blades to explore the medicinal use of these species. Semipermanent slides containing cross sections of the stems, petioles, and leaf blades, as well as paradermal sections of leaf blades, were prepared. The analyses were carried out in light and polarized optical microscopy. The histochemical analysis included different reagents depending on the target metabolite, which were analyzed by optical and fluorescence microscopy. Phytochemical tests of the methanolic extracts of the leaves were performed using thin layer chromatography. Anatomical characterization showed the characters of general occurrence in the family Cleomaceae and those that allow the differentiation of T. aculeata, T. diffusa, and T. spinosa. Histochemistry revealed the synthesis and/or storage sites of the metabolites and phytochemical tests; it was possible to observe the presence of different metabolites. The results bring comparative data on the anatomical and histochemical characterization of the species, thus increasing the taxonomic knowledge of the genus Tarenaya. RESEARCH HIGHLIGHTS: The comparative anatomy of three Tarenaya from Brazil was studied. Anatomical differences in different vegetative organs differ species. Differences in histochemistry and phytochemistry.

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