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11 August 2021 Senna pluribracteata (Leguminosae, Caesalpinioideae), a New Species from Paraíba State, Brazil, with Notes on Leaf Anatomy
Flávio Sousa Souto, Rubens Teixeira de Queiroz, Maria de Fátima Agra
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Abstract

A new species of the genus Senna from the Atlantic Forest of Paraíba State, Brazil, is described and illustrated based on a field collection, traditional taxonomic methodologies, and the analysis of Senna collections at RB and the main herbaria in northeastern Brazil. Morphologically, Senna pluribracteata is related to a group of four species of Senna sect. Chamaefistula ser. Bacillares: S. macranthera, S. pinheiroi, S. rizzinii, and S. rugosa, although S. pluribracteata has a set of distinctive anatomical characters that differentiate it: two extrafloral nectaries between leaflets in the rachis; large and conspicuous elliptic bracts 7.0–9.0 mm long along the inflorescence peduncle; the epidermis on the abaxial surface is conspicuously and compactly papillose; the rounded leaflet margins have palisade parenchyma near the apex; the mesophyll is dorsiventral with a single layer of palisade parenchyma, with isodiametric cells occupying approximately 60% of that structure; the petiole has a somewhat pentagonal shape and is planar adaxially; the rachis is obdeltoid and planar adaxially. Morphological and leaf anatomical descriptions, and a key to identifying the seven species of Senna ser. Bacillares found in Paraíba State are provided. The morphological and anatomical affinities of S. pluribracteata and its allied taxa are discussed.

© Copyright 2021 by the American Society of Plant Taxonomists
Flávio Sousa Souto, Rubens Teixeira de Queiroz, and Maria de Fátima Agra "Senna pluribracteata (Leguminosae, Caesalpinioideae), a New Species from Paraíba State, Brazil, with Notes on Leaf Anatomy," Systematic Botany 46(2), 352-360, (11 August 2021). https://doi.org/10.1600/036364421X16231782047325
Published: 11 August 2021
JOURNAL ARTICLE
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KEYWORDS
Atlantic forest
Cassia
FABACEAE
Senna sect. Chamaefistula
Senna ser. Bacillares
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