Two New Species of Melastomataceae from Southern Mesoamerica

摘要

Two new species of Melastomataceae, Blakea venusta (Blakeeae), endemic to Costa Rica, and Miconia dissitinervia (Miconieae), restricted to Costa Rica and Panama are described and illustrated. Blakea venusta is distinguished by its epiphytic, pendent habit, copious indument of spreading reddish-brown hairs, and paired leaves at a node that are commonly dimorphic in size. Miconia dissitinervia is characterized by a calyx that is fused in bud but ruptures at anthesis into irregular hyaline lobes. Distributional and phenological notes are provided together with diagnostic illustrations, photographs taken in the field, and keys to separate these species from their presumed closest relatives.