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Issue: Vol. 638 No. 3: 5 Mar. 2024
Type: Article
Published: 2024-03-05
DOI: 10.11646/phytotaxa.638.3.1
Page range: 209-226
Abstract views: 7
PDF downloaded: 1

Two new species and a new combination in Pleroma (Melastomataceae) from the Brazilian Atlantic Forest

Post-doctoral Researcher, Universidade Federal do Paraná, Programa de pós-graduação em Botânica.
Jardim Botânico do Rio de Janeiro, Programa de pós-graduação em Botânica, Escola Nacional de Botânica Tropical.
Universidade Federal do Paraná, Departamento de Botânica, Caixa Postal 19031, CEP 81531-970, Curitiba, PR, Brazil.
Mata Atlântica Melastomateae Nomenclature Taxonomy Tibouchina s.l. Eudicots

Abstract

Pleroma littorale is a new species described from several specimens collected in the Brazilian states of São Paulo, Paraná and Santa Catarina. It is morphologically similar to Pleroma urvilleanum, but differs by the cucullate bracteoles, with the apex obtuse and covering the flower bud (vs. ovate, with the apex acute and not covering the flower bud), and sepals with an obtuse apex (vs. attenuate). Pleroma semisterile is a new species described from six specimens collected in Pancas, state of Espírito Santo. It is morphologically similar to Pleroma fontanae, but differs by the longer petioles, 19–51.3 mm long (vs. 3.3–12.6 mm long), the antepetalous stamens with pedoconective and appendages covered by glandular trichomes (vs. glabrous), and narrower fruits, 5.5–6 mm wide (vs. 8.1–8.9 mm). One remarkable feature of the latter species is the androecium with apparently well-formed antesepalous stamens that do not produce pollen and are consequently staminoidal. This character has not been previously mentioned for species in Pleroma, but it may have been overlooked in species that are morphologically related to P. semisterile, such as P. fontanae, P. magdalenense, and P. manicatum. Finally, we also present the new combination Pleroma magdalenense, for a species originally described under Tibouchina that has been treated as a synonym of P. heteromallum.

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