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A phylogeny and new classification for Mesembryanthemoideae (Aizoaceae)

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Abstract:

We present a phylogeny for Mesembryanthemoideae (Aizoaceae) based on sampling of nearly all species and subspecies of the subfamily and analysis of cptrnL-F, rbcL-atpB, rps16, nrITS1 and morphology. The larger genera Phyllobolus and Mesembryanthemum are not monophyletic. Although some clades can be circumscribed with morphological (often homoplasious) synapomorphies, several clades are impossible to characterise morphologically. We recognise a single genus, Mesembryanthemum, in Mesembryanthemoideae. The genera Aptenia, Aridaria, Aspazoma, Brownanthus, Caulipsolon, Dactylopsis, Phyllobolus, Prenia, Psilocaulon, Sceletium, and Synaptophyllum are reduced to synonymy. Mesembryanthemum, which now consists of 101 species without recognised sections, can be distinguished by several uniquely derived morphological characters. Mesembryanthemum longipapillosum, which had recently been reduced to synonymy, is reinstated.

Keywords: AIZOACEAE; CLASSIFICATION; ITS1; MESEMBRYANTHEMOIDEAE; PHYLOGENY; RBCL-ATPB; RPS16; TRNL-F

Document Type: Research Article

Affiliations: Bolus Herbarium, University of Cape Town, 7701 Rondebosch, South Africa

Publication date: August 1, 2007

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