A new species of Prepusa (Helieae, Gentianaceae) from the Brazilian Atlantic Forest, with an emended key for the genus

The new species Prepusa dibotrya from the Brazilian Atlantic Forest in Espirito Santo is described and illustrated, with comments on its ecology, geographical distribution, and conservation status. The new species is similar to P. viridiflora and must be considered “critically endangered” in accordance with the criteria of the IUCN Red List of endangered plant species.