Journal
INTERNATIONAL JOURNAL OF PLANT SCIENCES
Volume 167, Issue 5, Pages 1029-1048Publisher
UNIV CHICAGO PRESS
DOI: 10.1086/505538
Keywords
Carex subgenus Vignea; Carex section Ovales; Carex section Stellulatae; hybrid speciation; ancestral character state reconstruction; nuclear ribosomal DNA
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Section Ovales is the most species-rich section of the sedge genus Carex in the New World. Phylogenetic analyses of molecular data recover a predominantly New World clade as sister to a solitary east Asian species, C. maackii. Nuclear ribosomal DNA are congruent in the placement of all taxa within the section, with a solitary exception: incongruence between ITS and ETS data in the placement of C. bonplandii and C. roraimensis suggests a hybrid origin for this lineage. Biogeography correlates strongly with phylogeny in the section, but there have been at least two instances of long-range dispersal, one from an eastern North American clade to western North America and one from the New World to Eurasia. Morphological characters studied are all homoplastic. Developing a comprehensive infrasectional classification with a phylogenetic basis would be complicated by the fact that most of the novel morphological characters in the section have evolved within relatively small, independent clades.
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