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

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. xverapax 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. xtorresianum and D. xsubternatum from Mexico and northern Central America. Both involve D. ternatum as one parent. Diplazium. cristatum is the other putative parent of D. xtorresianum, and D. plantaginifolium is the second parent of D. xsubternatum. We also designate lectotypes for D. cordovense and D. dissimile.