Abstract
We describe Pterolepis xaxa (Melastomateae, Melastomataceae), a new species collected in “caatinga rupestre” at Licínio de Almeida, Bahia, Brazil. Pterolepis xaxa resembles the recently described Pterolepis haplostemona, both representing the only two species in the genus that are haplostemonous (i.e., with the stamens equal in number to the petals). Apart from flowers with a single whorl of stamens, P. xaxa can also be recognized by intercalycine projections consisting of a very short central axis topped with 2–3 trichomes, and white petals (vs. intercalycine projections lacking trichomes at the apex and magenta or lilac petals in P. haplostemona).
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Acknowledgements
We thank Natanael Nascimento dos Santos for the drawings, and Frank Almeda and an anonymous reviewer for the suggestions on a previous version of the text. JCJ, NR and RG received grants from CNPq/Brazil (masters degree for the former and “produtividade em pesquisa” for the other two, respectively #311379/2022-2 and #310912/2021-0). This work was supported in part by the NSF (DEB-2001357 and 2002270).
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RG, NR and FAM conceived the study, provided the morphological description and taxonomic analyses, and contributed to writing; JCJ collected the plants, took the photos and helped preparing the illustration.
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Goldenberg, R., de Jesus, J.C., Roque, N. et al. Pterolepis xaxa (Melastomateae, Melastomataceae), a new haplostemonous species from Bahia, Brazil. Brittonia 75, 300–306 (2023). https://doi.org/10.1007/s12228-023-09747-x
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DOI: https://doi.org/10.1007/s12228-023-09747-x