New Species of Herpetacanthus (Acanthaceae) from the Atlantic Forest and Neighboring Areas (Brazil)

During a taxonomic review of the Neotropical genus Herpetacanthus (Acanthaceae) we found eight new species from the Atlantic Forest and one from a neighboring deciduous forest in Brazil: H. angustatus, H. chalarostachyus, H. delicatus, H. longipetiolatus, H. neesianus, H. parvispica, H. pauciflorus, H. strongyloides, and H. magnobracteolatus, which are here described and illustrated. Geographical distribution for each species is provided, as well as a key to all Atlantic forest species of Herpetacanthus.