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22 September 2015 A Unified Approach to Taxonomic Delimitation in the Fern Genus Pentagramma (Pteridaceae)
Eric Schuettpelz, Kathleen M. Pryer, Michael D. Windham
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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).

© Copyright 2015 by the American Society of Plant Taxonomists
Eric Schuettpelz, Kathleen M. Pryer, and Michael D. Windham "A Unified Approach to Taxonomic Delimitation in the Fern Genus Pentagramma (Pteridaceae)," Systematic Botany 40(3), 629-644, (22 September 2015).
Published: 22 September 2015
California Floristic Province
goldback ferns
low-copy nuclear gene
silverback ferns
Sonoran Desert
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