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Abstract Detail

Systematics Section/ASPT

Rabeler, Richard K. [1], Wagner, Warren L. [2], Hartman, Ronald L. [3].

Arenaria and Minuartia (Caryophyllaceae): an update since Harbaugh et al. (2010).

In 2010, Harbaugh et al. published a study detailing a new tribal alignment of the Caryophyllaceae, based on their phylogenetic study, especially members of the subfamily Alsinoideae.  Arenaria and Minuartia were both shown to be polyphyletic, but some questions remained unresolved, requiring more sampling within the groups; one major point was the delimitation of the genus Minuartia itself.  Subsequent to their work, two additional studies have helped to clarify these genera, especially Minuartia. With ca. 60 species sampled, representing eight of the 10 subgenera of Arenaria recognized by McNeill, three subgenera are now more appropriately treated as genera (Odontostemma, Eremogone + Eremogoneastrum). Results for subg. Dolophragma are ambiguous, but suggest it also should be recognized at the generic level.  Relationships among taxa in the 12 sections within subg. Arenaria also need additional investigation; the subgenus is not monophyletic. The situation in Minuartia, is more complex; 96 of the ca. 175 species have now been sampled and, in the most recent study, they appear in ten different clades that would be placed in four different tribes. Three of the subgenera are clearly not related to subg. Minuartia and, as in Arenaria, likely should be treated as genera (Rhodalsine, Eremogone p.p., and Triplateia). Subg. Minuartia itself is polyphyletic and is best considered as eight, or possibly more, genera. The thirty-four species of “Minuartia” in North America will now be distributed among at least five genera; Minuartia s.s. is no longer known in North America.

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1 - University of Michigan, Herbarium - EEB, 3600 Varsity Dr., Ann Arbor, MI, 48108-2228, USA
2 - Smithsonian Institution, Botany, MRC-166 National Museum Of Natural History, PO Box 37012, WASHINGTON, DC, 20013-7012, USA
3 - UNIVERSITY OF WYOMING, DEPT OF BOTANY, 3165, 1000 E. University Avenue, LARAMIE, WY, 82071-3165, USA

Phylogenetic classification
North American flora.

Presentation Type: Oral Paper:Papers for Sections
Session: 14
Location: Cottonwoods North/Boise Centre
Date: Monday, July 28th, 2014
Time: 2:45 PM
Number: 14006
Abstract ID:805
Candidate for Awards:None

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