Agradecimentos: We thank the Missouri Botanical Garden, Programa Nacional de Becas y Creditos Educativos del Peru (PRONABEC), and Conselho Nacional de Desenvolvimento Científico e Tecnológico, Brazil (CNPq) for financial assistance. We thank the curators of all herbaria cited in the paper for access to specimens. Thanks also go to John Pruski, Christine Niezgoda, Nancy Hensold, Robin Foster, and David Neill for collaboration and motivation for my research; to RBI Team of The Field Museum, Chicago, U. S. A. for access to collections, photos, and information with respect to habitat; to Klei Souza for the excellent illustration, and to Rosemeri Morokawa, Suzana Costa, Gustavo Shimizu, Nállarett Dávila, and Elluz Húaman for help with the revision of this article Ver menos

Ladenbergia shawistigma (Rubiaceae) is a new species from the Andean tepuis on the boundary of Loreto and San Martin departments in Peru. This new species is morphologically similar to L. moritziana and L. pauciflora, which are distributed in the Andean regions of Venezuela and Colombia, respectively. Ladenbergia shawistigma can be distinguished from these by the inflorescence resembling an umbelliform cyme with a short peduncle and three sessile flowers; hypanthium puberulous outside; small and deeply lobed calyx; and hirsute style. Ladenbergia shawistigma is only known from the Cordillera Escalera, Loreto, Peru Ver menos