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 18. Macropsychanthus grandiflorus (Martius ex Bentham 1837: 68 : 69) L.P. Queiroz & Snak (2020: 96) . ( Fig. 3c ) Vines , branches tomentulose, inermous. Nectary absent. Stipules triangular. Leaves imparipinnate, 3–foliolate, leaflets opposite, ovate, venation actinodromous, translucid punctuation absent. Inflorescence pseudoraceme, axillary. Flowers pedicellate, zygomorphic, diplostemonous; calyx gamosepalous, sepals 5, corolla dialypetalous, papilionaceous, violet, petals 5; androecium monadelphous, heterodinamous, anthers longitudinal; ovary superior, sessile, pluriovulate. Fruit legume, sessile, linear, plane, margin straight, epicarp tomentose, gray. Seeds orbicular, plane, coat brown, hilum central. Examined material:— BRAZIL . Paraíba : Maturéia, Pico do Jabre, 870 m elev., 14 October 2019 , fr., Aureliana Gomes 87224 ( UFP ); 17 September 2019 , fr., Aureliana Gomes 2052 ( HACAM ). Distribution and ecology:— The species can be found in Bolivia and Brazil , where it is restricted to the Northeast region, occurring in the states of Alagoas , Bahia , Ceará , Paraíba , Pernambuco , Piauí , Rio Grande do Norte and Sergipe , in the Caatinga domain (BFG 2018; Flora of Brazil 2020). Phenology:— Registered with fruits between September and October. Taxonomic discussion:— Macropsychanthus grandiflorus can be recognized, mainly by the vine habit, trifoliolate leaves with actinodromous venation, pseudoraceme inflorescence, flowers of violet corolla and vegetable fruit, tomentose, with constricted margin. Among the Papilionoideae species in this study, Macropsychanthus grandiflorus and Canavalia brasiliensis share the vine habit, the trifoliolate leaves and the papilionaceous corolla. However, they can be distinguished by the leaflets with actinodromous, flower with 5–lobed calyx, violet corolla and legume with constricted margin in M. grandiflorus vs. leaf with brochidodromous venation in leaflets, flowers with 4–lobed calyx, pink petals and legume with a straight margin in C. brasiliensis .