Two new species in the Maxillaria rufescens complex from Central America

Two new species in the Maxillaria rufescens complex are described from Central America, Maxillaria dressleriana Carnevali and J.T. Atwood is related to M. hedwigae Hamer and Dodson but flowers are red-maroon and are held erect on short pedicels, besides other differences in the shapes of the floral segments; it is known from Costa Rica and Panama. Maxillaria moralesii Carnevali and J.T. Atwood is only known with certainty from the Central Valley of Costa Rica and is related to the South American M. acutifolia Lindley but it is a larger flower with clear yellow-green flowers and differently shaped perianth segments. Illustrations and discussion on affinities of both new species are provided.