Diversification of the North American Doellingeria-Eucephalus Clade (Astereae: Asteraceae) Inferred from Molecular and Morphological Evidence
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Published:2019-11-14
Issue:4
Volume:44
Page:930-942
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ISSN:0363-6445
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Container-title:Systematic Botany
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language:en
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Short-container-title:Systematic Botany
Author:
Allen Geraldine A.,Brouillet Luc,Semple John C.,Guest Heidi J.,Underhill Robert
Abstract
Abstract—Doellingeria and Eucephalus form the earliest-diverging clade of the North American Astereae lineage. Phylogenetic analyses of both nuclear and plastid sequence data show that the Doellingeria-Eucephalus clade consists of two main subclades
that differ from current circumscriptions of the two genera. Doellingeria is the sister group to E. elegans, and the Doellingeria + E. elegans subclade in turn is sister to the subclade containing all remaining species of Eucephalus. In the plastid phylogeny,
the two subclades are deeply divergent, a pattern that is consistent with an ancient hybridization event involving ancestral species of the Doellingeria-Eucephalus clade and an ancestral taxon of a related North American or South American group. Divergence of the two Doellingeria-Eucephalus
subclades may have occurred in association with northward migration from South American ancestors. We combine these two genera under the older of the two names, Doellingeria, and propose 12 new combinations (10 species and two varieties) for all species of Eucephalus.
Publisher
American Society of Plant Taxonomists
Subject
Plant Science,Genetics,Ecology, Evolution, Behavior and Systematics
Cited by
1 articles.
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