Abstract
Cactaceae Juss. is a family comprising 124 genera and about 1438 species which are distributed from Canada to Patagonia, with the largest diversity in tropical and subtropical America (see e.g., Hunt et al. 2006). The flora of Brazil include 39 Cactaceae genera and 261 species, of which 14 genera and 54 species can be found at Rio de Janeiro state, so showing its importance for the biodiversity of cacti (BFG 2015).