This work consists in a taxonomic study of the Tribe Cassieae in the Engenheiro Ávidos Ecological Park, Cajazeiras - Paraíba, carried out between February/2017 an April/2018. Twelve species were recorded in the area, distributed in two genera: Chamaecrista (6) and Senna (6). Among the species found, we highlight Chamaecrista pilosa, here cited as a new registry for the state of Paraíba and the occurrences of C. amiciella and C. duckeana, endemic species of the Caatinga. Analytical key for species identification, morphological descriptions and complementary information are presented. In this context, the relevant contribution of this study to the knowledge of the flora in the region is evidenced.
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