Abstract
The neotropical genus Nautilocalyx Lind. ex Hanst., a group of terrestrial herbs with sappy stems, contains over 45 species of which many are still undescribed. The genus is distributed from Chiapas, Mexico [N. panamensis (Seem.) Seem.] and the Lesser Antilles [N. melittitolius (L.) Wiehler, N. mimuloides (Benth.) Morton] throughout northern South America into the Amapa area of eastern Brazil, and along the Amazon basin to Bolivia. Nautilocalyx and the related genera Alloplectus Mart. and Drymonia Mart. are not found in the gesneriad-rich region of southeastern Brazil. Native to Venezuela are N. villosus (Kunth & Bouche) Sprague, N. membranaceus (Morton) Wiehler, N. pallidus (Sprague) Sprague, N. porphyrotrichus (Lwbg.) Wiehler, and several undescribed species.
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