Translator Disclaimer
11 August 2020 Neptunia windleriana: A New Polyploid Species of Neptunia (Leguminosae) from Brazil Recognized by Anatomy, Morphology and Cytogenetics
Juliana Santos Silva, Márcia Santos Carvalho, Géssica Souza Santos, Francyane Tavares Braga, Maria José Gomes de Andrade, Vidal de Freitas Mansano
Author Affiliations +
Abstract

Neptunia windleriana, a new polyploid species of the pantropical genus Neptunia, is described and illustrated. This plant is endemic to the state of Bahia, Brazil, and is found in areas of Caatinga near the São Francisco River. Among the species occurring in Brazil, it is most similar to N. plena, a widespread species, by having a gland on the petiole, but it differs mainly by the number of pairs of pinnae and leaflets, shape of the spike in bud, and the size of the peduncles. It is morphologically distinct from all other species of the genus by the combination of prostrate subshrub habit, smaller leaves, shorter petiole and shorter rachis length, few-flowered, globose spikes, 10 stamens, and glabrous ovary. The presence of monocrystals in the bundle sheath cells of the bracts of N. windleriana is recorded here for the first time for the genus, together with the chromosome number (2n = 56 vs. 2n = 28, ∼52, 54, 56, 72, 78 for three other species of the genus occurring in Brazil), it can be also used to identify the species. The epidermis of the stipules, leaflet, and bracts of N. windleriana is uniseriate, with paracytic stomata. The vascular system has collateral arrangement with the vascular bundles covered by a sheath, with or without isolated monocrystals. Our data support earlier hypotheses that Neptunia has a base number of x2 = 14 which seems to be a secondary basic number that originated from an ancestral stock with x1 = 7 and underwent karyotypic evolution by polyploidy. A key to the Brazilian species of Neptunia as well as anatomical, cytogenetic, taxonomic, and geographic distribution data, ilustrations and photos are provided.

© Copyright 2020 by the American Society of Plant Taxonomists
Juliana Santos Silva, Márcia Santos Carvalho, Géssica Souza Santos, Francyane Tavares Braga, Maria José Gomes de Andrade, and Vidal de Freitas Mansano "Neptunia windleriana: A New Polyploid Species of Neptunia (Leguminosae) from Brazil Recognized by Anatomy, Morphology and Cytogenetics," Systematic Botany 45(3), 483-494, (11 August 2020). https://doi.org/10.1600/036364420X15935294613392
Published: 11 August 2020
JOURNAL ARTICLE
12 PAGES


SHARE
ARTICLE IMPACT
RIGHTS & PERMISSIONS
Get copyright permission
Back to Top