Macropsychanthus grandiflorus (Martius ex Bentham 1837: 68 : 69) L.P. Queiroz & Snak (2020: 96)

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 : 30

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 .

Figures

FIGURE 3. Species of Fabaceae Lindl. of the study area, Pico do Jabre State Park, Paraíba, Brazil. a Centrosema brasilianum. b Platymiscium floribundum. c Macropsychanthus grandiflorus d Centrosema sagittatum. e Ancistrotropis peduncularis. f Poecilanthe grandiflora. g Erythrina velutina. h Chamaecrista repens. i Canavalia brasiliensis. j Bauhinia cheilantha. k Stylosanthes viscosa. l Crotalaria vitelina. (Source: the authors).