Peltogyne barbata (Leguminosae, Detarioideae), a new species endemic to the Trombetas River area, Brazil

Summary Peltogyne barbata (Leguminosae, Detarioideae), a new species endemic to lake margins and the banks of the Trombetas River in the state of Pará, northern Brazil, is described and illustrated. The new species is morphologically similar to P. densiflora Spruce ex Benth. in fruit shape and flower morphology, and both species occur in flooded areas (igapó). Peltogyne barbata can be distinguished by its partially tomentose ovary, the coloration of its adaxial sepals, and for having leaves present near the inflorescences pre-anthesis but branches without leaves post-anthesis. We provide an identification key to the species of the genus Peltogyne that occur in the Trombetas River region, as well as a line drawing, a distribution map and colour photographs of the new species in its native environment.