Fabaceae Lindl. in a Conservation Unit in the Semi-Arid Region of Paraíba, Brazil Author Gomes, Aureliana Santos Departamento de Geografia - Universidade Federal de Campina Grande: - Campus I, Centro de Humanidades. Unidade Acadêmica de Geografia-UAG, R. Aprígio Veloso, 882, Universitário, Campina Grande, PB, 58428 - 830, Brasil. Author Rodrigues, Erimágna De Morais Author Moura, Débora Coelho Departamento de Geografia - Universidade Federal de Campina Grande: - Campus I, Centro de Humanidades. Unidade Acadêmica de Geografia-UAG, R. Aprígio Veloso, 882, Universitário, Campina Grande, PB, 58428 - 830, Brasil. Author Melo, José Iranildo Miranda De Programa de Pós-Graduação em Ecologia e Conservação - Universidade Estadual da Paraíba - UEPB, Departamento de Biologia, Centro de Ciências Biológicas e da Saúde, Av. das Baraúnas 351, Campus Universitário, Bairro Universitário, Campina Grande, PB, 58429 - 500, Brasil. Author Ribeiro, Rayane De Tasso Moreira Universidade Federal Rural de Pernambuco, Departamento de Biologia, Laboratório de Taxonomia Vegetal (LATAX), Rua Dom Manoel de Medeiros, s / n, Campus Dois Irmãos, 52.171 - 900, Recife, PE, Brasil. Author Queiroz, Rubens Teixeira De Departamento de Sistemática e Ecologia- Universidade Federal da Paraíba - Campus I, Centro de Ciências Exatas e da Natureza, Jardim Universitário, Castelo Branco, João Pessoa, PB, 58051 - 900, Brasil. & Author for correspondence: rbotânico @ gmail. com text Phytotaxa 2022 2022-07-19 555 1 17 41 http://dx.doi.org/10.11646/phytotaxa.555.1.2 journal article 102841 10.11646/phytotaxa.555.1.2 2e2412c5-4709-4f24-b489-db901a316721 1179-3163 6875635 13. Chamaecrista zygophylloides H.S. Irwin & Barneby (1982: 660) . ( Fig. 4c ) Shrubs , branches glabrous, inermous. Nectary absent. Stipules caducous. Leaves paripinnate, 4–foliolate, leaflets opposite, obovate, venation brochidodromous, translucid punctuation absent. Inflorescence raceme, terminal. Flowers pedicellate, asymmetric, diplostemonous; calyx dialysepalous, sepals 5, corolla dialypetalous, violet, petals 5; androecium dialystaminous, homodinamous, anthers longitudinal; ovary superior, sessile, pluriovulate. Fruit legume, sessile, linear, plane, margin straight, epicarp glabrous, brown. Seeds obovate, plane, coat black, hilum basal. Examined material:— BRAZIL . Paraíba : Maturéia , Pico do Jabre , 800 m elev., 17 December 2018 , fl., Aureliana Gomes 2019 ( HACAM ) . Distribution and ecology: —The species has disjunct distribution, with records in Mexico , Central America, Guyana , Venezuela and eastern Brazil where it is registered in the Northeast and Southeast regions related to the Caatinga, Cerrado and Atlantic Rainforest biomes (INCT - Virtual Herbarium of Flora and Fungi; Queiroz 2009). Phenology:— Registered with flowers in December. Taxonomic discussion:— Chamaecrista zygophylloides can be recognized, mainly, by the shrub habit, 4– leaflet leaves, racemous inflorescence, terminal and asymmetrical pedicel flowers. In the study area, it is among the tetrafoliolate species, characteristic in Chamaecrista exclusive of this among similar species. The tetrafoliolate leaves were also observed in Arachis dardanii and in Senna species. However, Chamaecrista zygophylloides differs from other species with tetrafoliolate leaves by the presence of bracteole.