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Systematic position of Ivania, Scoliaxon, and Phravenia (Brassicaceae)

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Abstract:

Sequence data from the ribosomal internal transcribed spacer (ITS) region were used to determine the tribal placements of the previously unassigned genera Ivania, Scoliaxon, and Phravenia (gen. nov.; named in honor of Dr. Peter H. Raven). The utilization of the ITS-based phylogenetic tribal backbone of Brassicaceae placed three genera in relation to the 44 recognized tribes in the family. Scoliaxon, although showing remarkable morphological similarities to Asta (Asteae), formed an independent clade with 100% bootstrap (BS) support in the tribal analysis, whereas both Ivania and Phravenia clustered with the Thelypodieae clade (96% BS support). In a second and more comprehensive analysis of Thelypodieae, both species of Ivania formed a clade with 61% BS support within the tribe and were affiliated to other Thelypodieae genera from the Southern Hemisphere. The monospecific Phravenia (P. viereckii, formerly Arabis/Dryopetalon viereckii) formed a clade with 74%–76% bootstrap support within Thelypodieae, and its species did not resolve with Dryopetalon or Sibara in which it had been previously assigned. The present findings support the placement of Ivania and Phravenia in Thelypodieae, as well as the recognition of the new genus Phravenia and new tribe Scoliaxoneae, both of which are formally described herein.

Keywords: BRASSICACEAE; ITS-BASED TRIBAL PHYLOGENY; IVANIA; PHRAVENIA; SCOLIAXON; SCOLIAXONEAE

Document Type: Research Article

Affiliations: 1: Eastern Cereal and Oilseed Research Centre, Agriculture and Agri-Food Canada, Central Experimental Farm, Ottawa, Ontario K1A 0C6, Canada 2: Missouri Botanical Garden, P.O. Box 299, St. Louis, Missouri 63166-0299, U.S.A.

Publication date: August 1, 2011

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