Acta Botanica Mexicana
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Gonolobus cthulhui (Apocynaceae), a new species from Oaxaca, Mexico

Publication Date Jul 8, 2022

Abstract

Background and Aims: In Mexico, the genus Gonolobus is currently represented by 43 species. Gonolobus has been studied for some regional floras and taxonomic novelties are continuously being described. In this context, during the review of the herbarium material and collections made in the state of Oaxaca, a specimen that failed to be assigned to any described Gonolobus in Mexico and Mesoamerica was found. Therefore, the objective of this work was to describe a new species of Gonolobus from Oaxaca. Methods: Eleven herbaria and five virtual collections were revised, and several field trips to Oaxaca were conducted in 2018 to collect specimens. The studied material was compared with other species with similar morphology, a comparative table was prepared, and a distribution map included. The conservation status of the species based on field observations according to the IUCN Red List criteria is presented. Key results: A new species of Gonolobus from southeastern Oaxaca, Mexico, with large green corollas, is described herein. A description and images of the new species are provided. Gonolobus cthulhui is morphologically similar to G. leianthus and G. pancololote, but differs by its black-tipped and widely ovate to suborbicular sepals, pubescent diagonal pattern on the corolla lobes, and thinner and discontinuous faucal annulus. An Endangered (EN) conservation category is suggested for this species. Conclusions: This discovery highlights Oaxaca as the second state, after Chiapas, with most species of Gonolobus (19 spp.), and Mex...

Concepts

Taxonomic Novelties Corolla Lobes Virtual Collections Comparative Table Similar Morphology Endangered Category Large Corollas Field Observations Herbarium Collections Endangered

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