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Diplazium hybrids involving D. plantaginifolium and D. ternatum from Mexico and Central America

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Abstract

Here we evaluate the origins and relationships of Mexican and Central American Diplazium hybrids derived from crosses involving either D. plantaginifolium or D. ternatum. Based on study of live plants and herbarium specimens, we distinguish D. ×verapax from the similar D. riedelianum and present evidence that the former is a sterile hybrid derived from a cross between D. plantaginifolium and D. werckleanum. We also describe new hybrids, D. ×torresianum and D. ×subternatum from Mexico and northern Central America. Both involve D. ternatum as one parent. Diplazium. cristatum is the other putative parent of D. ×torresianum, and D. plantaginifolium is the second parent of D. ×subternatum. We also designate lectotypes for D. cordovense and D. dissimile.

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Acknowledgments

We thank the community of San Francisco la Reforma II in Oaxaca, Mexico, for permission to collect on their communal lands and for being exceptionally gracious hosts during our stay with them. In Nicaragua, Dra. Indiana Coronado provided logistic support during fieldwork. Conversations with Drs. David Barrington, Robbin Moran, and Alan Smith were critical in developing the ideas presented in this work; we also thank Dr. James Solomon for providing access to herbarium material. We thank Art Gilman, Susan Fawcett, Nikisha Patel, and Morgan Southgate for helpful comments on an early version of this manuscript, and Claudine Mynssen and one anonymous reviewer for comments that greatly improve this manuscript. This work supported in part by an NSF Graduate Research Fellowship and a Graduate Student Research Award from the American Society of Plant Taxonomists awarded to W.T., a grant from the Programa UNAM-DGAPA-PAPIIT (IA201416) awarded to A.V., and a CONACyT grant (convocatoria INFR-2016-01, proyecto No. 269382) awarded to the National Herbarium of Mexico (MEXU).

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  1. Pringle Herbarium, Plant Biology Department, University of Vermont, 27 Colchester Ave., Burlington, VT, 05401, USA

    Weston L. Testo & Michael Sundue

  2. Instituto de Biología, Universidad Nacional Autónoma de México (UNAM), Circuito Exterior s/n, Ciudad Universitaria A.P. 70-367, C.P. 04510, Ciudad de México, DF, Mexico

    Alejandra Vasco

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  1. Weston L. Testo
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  2. Michael Sundue
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Correspondence to Weston L. Testo.

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Testo, W.L., Sundue, M. & Vasco, A. Diplazium hybrids involving D. plantaginifolium and D. ternatum from Mexico and Central America. Brittonia 69, 295–306 (2017). https://doi.org/10.1007/s12228-017-9476-2

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