Typification and synonymy of the Atlantic Forest endemic species Napeanthus primulifolius (Gesneriaceae)

During the nomenclatural revision of Acanthaceae names described by Friar J.M.C. Vellozo in his Florae fluminensis, we realized that Pedicularis acaulis Vell. was conspecific with Napeanthus primulifolius (Gesneriaceae), a Brazilian Atlantic Forest endemic species. This study presents the complete and updated synonymy of N. primulifolius, including two new synonyms: Pedicularis acaulis and Oreocharis notha C.B.Clarke. We also propose a lectotype for N. primulifolius based on G.Raddi’s specimens and P. acaulis based on Vellozo’s original plate.