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Issue: Vol. 592 No. 3: 20 April 2023
Type: Article
Published: 2023-04-20
DOI: 10.11646/phytotaxa.592.3.4
Page range: 255-266
Abstract views: 180
PDF downloaded: 11

Two new Mexican species of Asclepias (Apocynaceae; Asclepiadoideae; Asclepiadeae)

Departamento de Biología Comparada, Facultad de Ciencias, Universidad Nacional Autónoma de México, Apartado Postal 70–282, 04510, México, Ciudad de México.
Calle San Cristóbal Colón 34. Huatulco de Mercado, Jalisco.
Departamento de Biología Comparada, Facultad de Ciencias, Universidad Nacional Autónoma de México, Apartado Postal 70–282, 04510, México, Ciudad de México
taxonomy Jalisco Coahuila endemic species Eudicots

Abstract

Two new species of Asclepias from Mexico are described here: A. sauronii and A. graogramanii. The first species, from the states of Coahuila and Nuevo Leon, is morphologically similar to A. otarioides, but differs by its ovate-lanceolate to lanceolate leaves and its yellow corona with digitated and curved horns. The second species, distributed in Jalisco and Nayarit, is similar to A. glaucescens, but differs by its pink to white-pinkish flowers, its sessile gynostegium and its cylindrical to oblongoid, and rarely slightly conduplicate hoods. Descriptions, morphological comparisons, and geographic distributions of these species as well as a proposal of their conservation status are provided in this study. This discovery highlights Mexico as a center of diversity of the genus, with 75 species currently known in the country. Furthermore, 45.3% of those species are endemic to Mexico.

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