Chamaecrista rotundifolia ( Persoon 1805: 456 ) Greene (1899:31)

Gomes, Aureliana Santos, Rodrigues, Erimágna De Morais, Moura, Débora Coelho, Melo, José Iranildo Miranda De, Ribeiro, Rayane De Tasso Moreira & Queiroz, Rubens Teixeira De, 2022, Fabaceae Lindl. in a Conservation Unit in the Semi-Arid Region of Paraíba, Brazil, Phytotaxa 555 (1), pp. 17-41 : 28

12. Chamaecrista rotundifolia ( Persoon 1805: 456) Greene (1899:31)

Herbs, branches pilose, inermous. Nectary absent. Stipules lateral stipules, ovate. Leaves paripinnate, 2–foliolate, leaflets opposite, obovate, venation actinodromous, translucid punctuation 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., 13 May 2019, fl. & fr., Aureliana Gomes 2098 ( HACAM) .

Distribution and ecology:— The species occurs from the western United States of America to Uruguay, has records in the five regions of Brazil in all its phytogeographic domains ( Flora do Brasil 2020), associated with open and anthropogenic environments with invasive plant behavior (Queiroz; Loiola, 2009; Dantas; Silva, 2013, Souto et al. 2019).

Phenology:— Registered with flowers and fruits in May.

Taxonomic discussion:— Chamaecrista rotundifolia can be recognized by the absence of nectary, bifoliolate leaves, asymmetrical pedicel flowers, dialypetalous corolla.