 Research has been conducted on it in Brazil as an anti-diabetic drug.Pedra hume caá is a medium-sized shrub that grows in drier regions of the Amazon and other parts of Brazil.In Brazil, the common name pedra hume caá refers to three species of myrcia plants that are used interchangeably-Myrcia salicifolia, Myrcia uniflorus, and Myrcia sphaerocarpa.