Senna angulata H.S.Irwin & Barneby (1982: 177)

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 : 34

30. Senna angulata H.S.Irwin & Barneby (1982: 177)

Shrubs erect, branches tomentose, inermous. Nectary rachis, stipitate. Stipules lateral, acicular. Leaves paripinnate, 4– foliolate, leaflets opposite, lanceolate, venation brochidodromous, translucid punctuation absent. Inflorescence raceme, terminal. Flowers pedicillate, zygomorphic, diplostemonous; calyx dialysepalous, sepals 5, corolla dialypetalous, yellow, petals 5; androecium dialystaminous, heterodinamous, anthers poricidal; ovary superior, stipitate, pluriovulate. Fruit berry, stipitate, linear, cylindric, margin straight, epicarp tomentulose, black. Seeds obovate, plane, coat black, hilum basal.

Examined material:— BRAZIL. Paraíba: Maturéia, Pico do Jabre , 1.000 m elev., 12 April 2019, fl. Aureliana Gomes 2015 ( HACAM) .

Distribution and ecology:— The species is endemic to Brazil, with records in the states of Bahia, Espírito Santo, Minas Gerais, Rio de Janeiro, São Paulo, Paraná and Santa Catarina associated with the Cerrado and Atlantic Rainforest domains in areas of ombrophilous and seasonal forest ( Tozzi 2016).

Phenology:— Registered with flowers in April.

Taxonomic discussion:— Senna angulata can be recognized, mainly, by the shrub habit, 4-leaflet leaves and inflorescence in terminal raceme, with yellow corolla flowers, heterodinamous androecium, poricidal anthers and bacoid fruit. Senna species found in the studied area have 4–leaflet leaves, except Senna martina and S. obtusifolia , which have a higher number of leaflets. Among the representatives of Senna 4–leaftles, S. angulata is the one with the largest size, which can be confused with Senna macranthera . However, the first is an erect shrub, while the second is a scandant shrub.