Triolena anisophylla (Melastomataceae), a new and threatened species endemic to Panama

Summary A new species of Triolena, endemic to Colón Province, Panama, is described and illustrated. The specimens of this taxon were previously identified as Triolena lanceolata , but closer inspection has shown them to be morphologically and geographically distinct. Triolena anisophylla K.Samra & Michelang. grows on rocks and tree trunks along rivers in Colón Province. This species is distinguishable by its strongly anisophyllous leaves and unique trichomes on the adaxial surface of the leaves. A complete description, distribution map, preliminary conservation assessment, taxonomic notes, and regional key are provided.