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 10. Chamaecrista nictitans (Linnaeus 1753: 380) Moench (1794: 272) . ( Fig. 4a ) Subshrubs , branches pilose, inermous. Nectary petiolar, sessile. Stipules lateral, narrow-triangular. Leaves paripinnate, 30–32–foliolate, leaflets opposite, oblong, venation actinodromous, translucid punctuation absent absent. Inflorescence cymose, axillary. Flowers pedicellate, asymmetric, diplostemonous; calyx dialysepalous, sepals 5, corolla dialypetalous, yellow, petals 5; androecium dialystaminous, homodinamous, anthers longitudinal; ovary superior, sessile, pluriovulate. Fruit legume, sessile, linear, plane, margin straight, epicarp glabrous, brown. Seeds trapezoid, plane, coat black, hilum basal. Examined material:— BRAZIL . Paraíba : Maturéia , Pico do Jabre , 800 m elev., 05 October 2018 , fl. & fr., Aureliana Gomes 49 ( JPB ) . Distribution and ecology:— The species is polymorphic found in all regions of Brazil , in the phytogeographic domains of the Amazon, Caatinga, Cerrado, Atlantic Rainforest and Pantanal, in rocky environments, seasonal forests and highland swamps ( Escobar 2014 ; Flora do Brasil 2020 ). Phenology:— Registered with flowers and fruits in October. Taxonomic discussion:— Chamaecrista nictitans can be recognized by the subshrub habit, pilose branches, axillary cymose inflorescence and sessile legume fruit. This genus had four species, Chamaecrista nictitans morphologically more similar to Chamaecrista repens by multi-leaf leaves, but they are distinguished by sessile nectary and 30–32– leaflet leaves in C. nictitns vs. stipulate nectary and 20–22–leaflet leaves in C. repens .