The native goldback and silverback ferns of western North America, composing the genus Pentagramma, are phylogenetically isolated within the xeric-adapted cheilanthoid clade. Although species-poor compared to its sister group, Pentagramma encompasses a diverse array of morphotypes, cytotypes, and flavonoid chemotypes. Because the differences are generally cryptic, however, the various entities are usually recognized at an infraspecific level. In recent years, as many as five subspecies have been ascribed to P. triangularis, and only P. pallida has been considered sufficiently divergent to warrant recognition as a distinct species. In this study, we take a unified approach to taxonomic delimitation in Pentagramma. Combining spore studies with phylogenetic analyses of plastid and nuclear sequences, we identify six genetically and morphologically distinct diploid lineages, each of which is here treated as a species. A new species is described (P. glanduloviscida) and three new combinations are made (P. maxonii, P. rebmanii, and P. viscosa).
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the BioOne website.
Vol. 40 • No. 3