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Article
Published: 2016-08-17

Marsdenia calichicola (Apocynaceae), a narrow endemic, endangered new species from the Mexican Yucatan Peninsula

Herbario CICY, Centro de Investigación Científica de Yucatán, A. C., Calle 43, No. 130 x 32 x 34, Colonia Chuburná de Hidalgo, 97205 Mérida, Yucatán, México. Orchid Herbarium of Oakes Ames, Harvard University Herbaria, 22 Divinity Avenue, Cambridge, Massachusetts 02138, U.S.A.
Herbario CICY, Centro de Investigación Científica de Yucatán, A. C., Calle 43, No. 130 x 32 x 34, Colonia Chuburná de Hidalgo, 97205 Mérida, Yucatán, México. The Institute for Regional Conservation. 100 East Linton Boulevard, Suite 302B, Delray Beach, Florida 33483, U.S.A.
Departamento de Botánica, Instituto de Biología, Universidad Nacional Autónoma de México, México D.F., C.P. 04510, Apartado Postal 70-367, México.
Herbario CICY, Centro de Investigación Científica de Yucatán, A. C., Calle 43, No. 130 x 32 x 34, Colonia Chuburná de Hidalgo, 97205 Mérida, Yucatán, México.
Herbario CICY, Centro de Investigación Científica de Yucatán, A. C., Calle 43, No. 130 x 32 x 34, Colonia Chuburná de Hidalgo, 97205 Mérida, Yucatán, México.
Herbario CICY, Centro de Investigación Científica de Yucatán, A. C., Calle 43, No. 130 x 32 x 34, Colonia Chuburná de Hidalgo, 97205 Mérida, Yucatán, México.
Herbario CICY, Centro de Investigación Científica de Yucatán, A. C., Calle 43, No. 130 x 32 x 34, Colonia Chuburná de Hidalgo, 97205 Mérida, Yucatán, México. Instituto Tecnológico de Chiná, Calle 11 entre 22 y 28, Colonia Centro, Chiná 24050, Campeche, México.
Asclepiadoideae Endemism IUCN Marsdenia sect. Edules Marsdeniae Mexico Yucatan Peninsula Biotic Province Eudicots

Abstract

Marsdenia (Apocynaceae: Asclepiadoideae, Marsdeniae) is represented by five species in the Mexican Yucatan Peninsula (vs. seven in the whole of the province), one of which is herein proposed as new to science.  The new species, Mardenia calichicola Carnevali & Juárez-Jaimes, is only known from a narrow strip of sub-xerophytic forests over calcareous, rocky soils along the northwestern edge in the Yucatán state of Mexico. Marsdenia calichicola is morphologically similar and likely related to M. gallardoae and M. trivirgulata. Among other characters, it differs from Marsdenia gallardoae by the presence of a corona composed of cushion-like calli (corolla lacking calli in M. gallardoae) whereas M. trivirgulata has a glabrous or glabrescent corolla (vs. pubescent in M. calichicola); additional characters are herein discussed. We provide pertinent iconography to aid in the identification of the new species plus a key to diagnose the three species in the M. trivirgulata complex. The conservation status of the new taxon is assessed against the IUCN criteria as CR. A distribution map and a key to the species of Marsdenia from the Yucatan Peninsula Biotic Province are presented.