Abstract
Psidium guajava L. is widely used in folk medicine. The use of plants to treat diseases is an ancient habit common to many civilizations. Brazil has vast biodiversity and the commercialization of therapeutic preparations based on natural products demands characterization of the raw material used. This work aimed at the pharmacobotanical study of P. guajava L. species belonging to the Myrtaceae family. On the collected and identified leaves, studies of the external and internal leaf morphology were carried out through macroscopic and microscopic analysis. The main morphoanatomical characteristics of the leaves of P. guajava L. were determined, which can be used as tools in the quality control of this species for the purposes of identifying Traditional Phytotherapy Products that are presented in the form of a fresh, dried or crushed plant, making their use of this plant in a safer therapeutic way.
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