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Abstract Detail

Systematics Section/ASPT

Gilmour, C.N. [1], Starr, J.R. [1], Naczi, R.F.C. [2].

Phylogeny within the hyper-diverse Scirpeae s.s./Dulicheae/Cariceae clade (Cyperaceae).

Over the past 50 years, evidence from embryo types, fruit epidermal silica bodies, and morphological and molecular phylogenies has indicated that the sedge genus Scirpus s.l. (200-300 spp.) was polyphyletic. Although many of the genera segregated from Scirpus s.l. were clearly of distant relationship to Scirpus s.s. (e.g. Isolepis, Schoenoplectus), for others, such as Eriophorum or Trichophorum, their delineation from Scirpus and their relationships to this genus remain unclear owing to a series of intermediate taxa. In addition, the relationships of these genera to each other and to a series of genera within a wider clade consisting of tribes Scirpeae s.s., Dulicheae, Cariceae, and the monotypic genus Khaosokia, are still unresolved. Using the cpDNA genes matK and ndhF our results suggest there are five major lineages sister to Khaosokia with tribe Dulicheae forming the basal element of the entire Scirpeae s.s./Dulicheae/ Cariceae clade. Molecular and embryo type analyses further suggest the discovery of a new genus. Separate nrDNA ETS 1f and matK analyses focused within this new genus strongly suggest it consists of two species each possessing unique morphological and anatomical characters. The ranges of these species are allopatric and each is confined to unique habitats in separate mountain ranges.

Broader Impacts:

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1 - Canadian Museum of Nature, Ottawa, ON, K1P6P4, Canada
2 - The New York Botanical Garden, Bronx, NY, 10458-5126, USA

none specified

Presentation Type: Oral Paper:Papers for Sections
Session: 26
Location: Franklin B/Hyatt
Date: Tuesday, July 10th, 2012
Time: 8:15 AM
Number: 26002
Abstract ID:358

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