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| Gonolobus villasenorii L.O. Alvarado, Pío-León, Morillo et S. Islas, in Alvarado-Cárdenas, Pío-León, Morillo et Islas-Hernández, 2024. |
Abstract
In this study a new species of Gonolobus, G. villasenorii, is described. It is endemic to Sinaloa, Mexico, distributed in the Sierra Madre Occidental in pine–oak forest. This species is characterized by the presence of lanceolate sepals, margin of the corolla lobes with a whitish-green callus, without being cristate, and anthers with rectangular dorsal appendages. The new species is compared to Gonolobus chloranthus and Gonolobus erianthus. Gonolobus grandiflorus, Gonolobus incerianus, and Gonolobus lozadae are species with which it shares reticulate corollas and flowers more than 2 cm in diameter. A detailed description of the new species includes data on its habitat, ecology, phenology, conservation status, a distribution map, and a section where the new species is compared with similar species and how to recognize it.
Keywords: Sierra Madre Occidental; Gonolobus grandiflorus; Gonolobus erianthus; critically endangered
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| Gonolobus villasenorii: (A) Branch segment with inflorescence and flower bud. (B) Flower. (C) Longitudinal section of the flower (D) apex of the style head. (E) Pollinarium. Illustrations by Quiyahuitl Colibrí Fernández Armendáriz, based on the holotype J. F. Pío-León & M. Pérez 359. |
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| Gonolobus villasenorii: (A) Branch with leaves. (B) Leaves and flower bud. (C) Overhead view of the flower. (D) Lateral view of the flower. (E) Front view of the flower. |
Gonolobus villasenorii L.O. Alvarado, Pío-León, Morillo et S. Islas sp. nov.
Diagnosis. Individuals similar to Gonolobus erianthus in having flowers of similar size, corolla lobes ovate with flat stylar head with purple margin; the taxon (explanatory hypothesis) proposed here differs by its lanceolate sepals (vs. broadly ovate sepals in Gonolobus erianthus), margin of corolla lobes with greenish-white callus, without being cristate (margin with green callus, cristate), and anthers with narrowly rectangular dorsal appendages (vs. quadrangular dorsal appendages).
Etymology: The name honors our friend and colleague, Dr. José Luis Villaseñor Ríos, a Mexican botanist who has made important contributions to the knowledge of the systematics and distribution of Asteraceae and the Mexican flora.
Leonardo O. Alvarado-Cárdenas, Juan F. Pío-León, Gilberto Morillo and Carla Sofía Islas-Hernández . 2024. A New Gonolobus Species (Apocynaceae, Asclepiadoideae) from Sinaloa, Mexico. Taxonomy. 4(1); 1-9. DOI: 10.3390/taxonomy4010001