Spathacanthus magdalenae sp. nov. (Acanthaceae), a riparian forest species from Veracruz, Mexico

Spathacanthus magdalenae Cast.-Campos (Acanthaceae) is described and illustrated as a new riparian forest species from central Veracruz and from the eastern slopes of the volcano Cofre de Perote, Mexico. The new species is similar to Spathacanthus parviflorus, but differs in wider leaves and longer corolla tube. A key to all four species of Spathacanthus is provided.