Abstract
Until the end of the past century, Deguelia species had been described or combined under the taxa Lonchocarpus and Derris. Although most of the species have recently been combined in some regional studies, four endemic species from the Guiana Shield (one of which also occurs in adjacent areas of Venezuela and Colombia) remain to be combined under Deguelia. Here, we propose new combinations for Lonchocarpus chrysophyllus, Lonchocarpus martynii, Lonchocarpus pictus and Lonchocarpus rufescens, with comments on their taxonomy, distribution, ecology and vernacular names. Furthermore, two new synonyms and five lectotypes are proposed here.