Nomenclatural and taxonomic notes on Salvia sections Nobiles and Angulatae (Lamiaceae: Mentheae), with updated identification keys for these sections in Brazil

Salvia sect. Angulatae and S. sect. Nobiles are among the sections of Salvia L. (Lamiaceae) with most of their Brazilian species represented in the Atlantic Forest and the Cerrado domains, which are important regions of species richness for the genus. After extensive evaluation of the literature, populations in situ and specimens in herbaria, including nomenclatural types, we identified a requirement for taxonomic and nomenclatural changes in S. arenaria and S. sellowiana, and for updated identification keys and taxonomic notes for the other members of these sections, particularly S. rivularis in S. sect. Nobiles. Two names are synonymised, Salvia articulata = S. sellowiana and S. itatiaiensis = S. arenaria and notes on the nomenclature and morphology of these species are provided. A first-step lectotypification (S. arenaria var. sellowii) and a second-step lectotypification (S. itatiaiensis) are also presented, as well as detailed descriptions for S. arenaria and S. sellowiana and preliminary conservation status assessments for both.