Thursday, June 1, 2017

[Botany • 2016] Tibouchina rosanae • A New and Unusual Amphistomatic Species of Tibouchina (Melastomeae, Melastomataceae) from Brazil


 Tibouchina rosanae   P. J. F. Guim. & Woodgyer


Abstract

Tibouchina rosanae, a new species of Melastomataceae (Melastomeae) from the state of Mato Grosso, Brazil, is described, illustrated and compared to its putative closest allied. It is characterized mainly by the inflorescence that is lax. Tibouchina rosanae is an amphistomatic species, and the presence of stomata on the adaxial leaf surface is reported here for the first time in the genus.

Keywords: Mato Grosso, Xingu State Park, Eudicots, Brazil


Tibouchina rosanae P. J. F. Guim. & Woodgyer, sp. nov.  

Etymology:— This species is dedicated to Dr. Rosana Romero, in recognition of her contributions to the taxonomy of Neotropical Melastomataceae, particularly in tribe Microlicieae, and her skilled ability to supervise new students in the study of this botanical family.  

Distribution and Habitat:— Tibouchina rosanae is recorded for ca. 290 m elevation, growing in patches of Amazon grassland vegetation on sandstone rocks (campos rupestres) in Xingu State Park, in the municipality of Santa Cruz do Xingu, Mato Grosso state, Brazil.


Paulo José Fernandes Guimarães and Elizabeth M. Woodgyer. 2016. A New and Unusual Amphistomatic Species of Tibouchina (Melastomeae, Melastomataceae) from Brazil. Phytotaxa. 246(2); 145 - 151. DOI:  10.11646/phytotaxa.246.2.6

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