Ford, Bruce A.
Hipp, Andrew

Sedges: Uses, Diversity, and Systematics of the Cyperaceae (Monographs in Systematic Botany from the Missouri Botanical Garden)

Date created
Carex L. sect. Ovales Kunth, with approximately 85 species worldwide, is one of the largest sections in the genus and the largest in Carex subg. Vignea (P. Beauv. ex T. Lestib.) Peterm. (ca. 400 species). Sequence data from the internal transcribed spacer (ITS) region and 5.8S gene of nuclear ribosomal DNA (nrDNA) demonstrate that section Ovales is monophyletic, including the East Asian C. maackii Maxim. and the two species of section Cyperoideae G. Don, but excluding C. illota L. H. Bailey. The two main synapomorphies that define section Ovales—winged perigynia and true vegetative culms—have each evolved independently in at least one other lineage in the genus. Moreover, the traditional infrasectional taxonomy of section Ovales is based on morphological characters that are for the most part homoplastic. The majority of eastern North American species in section Ovales form a single lineage (“ENA Clade I”) that derives from a poorly resolved western North American group
Alternate Title
Phylogeny and Patterns of Convergence in Carex Sect. Ovales (Cyperaceae): Evidence from ITS and 5.8S Sequences