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 21. Mimosa invisa Martius ex Colla (1834: 255) . ( Fig. 4f ) Vines , branches glabrous, aculeate. Nectary absent. Stipules lateral, narrow–triangular. Leaves bipinnate, paripinnate, 8–foliolate, leaflets opposite, oblong, venation actinodromous, translucid punctuation absent. Inflorescence spike, axillary. Flowers sessile, actinomorphic, isostemonous; calyx gamosepalous, sepals 4, corolla gamopetalous, tubular, rose, petals 4; androecium dialystaminous, homodinamous, anthers longitudinal; ovary superior, sessile, pluriovulate. Fruit craspedium, sessile, linear, plane, margin straight, epicarp pilose, brown. Seeds obovate, plane, coat brown, hilum basal. Examined material:— BRAZIL . Paraíba : Maturéia , Pico do Jabre , 875 m elev., 13 October 2019 , fl. & fr., Aureliana Gomes 2022 ( HACAM ) . Distribution and ecology:— The species has a wide distribution in South America. In Brazil , it occurs in all regions, being widely distributed in the Northeast (BA, CE, PE, PI, RN) associated with the Amazon, Caatinga, Cerrado and Atlantic Rainforest domains, found in rocky outcrops vegetation, and seasonal forests, as well as anthropized areas ( Flora do Brasil 2020 ). Phenology:— Registered with flowers and fruits in October. Taxonomic discussion:— Mimosa invisa can be recognized, mainly, by the shrub habit, glabrous branches, with rickly., inflorescence pink spikes and long craspedium with straight margin. This was the only representative of Mimosa with a vine habit, a characteristic that differs from the other similar species found in the study area, which show arboreous habit.