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Type: Article
Published: 2020-11-27
Page range: 51–61
Abstract views: 37
PDF downloaded: 1

Dioon oaxacensis (Zamiaceae): a new cycad species from the arid central valleys of Oaxaca (Mexico)

Department of Biology, Chiba University, Chiba 263-8522, Japan.
Herbario Eizi Matuda, Laboratorio de Ecología Evolutiva, Instituto de Ciencias Biológicas, Universidad de Ciencias y Artes de Chiapas.
Departamento de Biología Evolutiva, Instituto de Ecología, A.C.
Sociedad para el Estudio de los Recursos Bióticos de Oaxaca
Ganna Walska Lotusland
arid zones cycads Mexico Neotropical Oaxaca Gymnosperms


Dioon oaxacensis sp. nov. (Zamiaceae), a new cycad species from Oaxaca, Mexico, is described. The morphological traits of the new taxon are compared with its sister species, D. merolae. The species delimitation between the two species is consistent with previously published genetic evidence. Dioon oaxacensis can be easily identified by its flat, stiff, straight leaflets obliquely inserted to rachis, and by its large reproductive structures. Populations of D. oaxacensis usually occur in dry habitats, growing on rocky hillsides, and co-habiting with plants well recognized to be adapted to aridity.