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Publication Type J
Authors Bohley, K., P. J. D. Winter and G. Kadereit
Title A Revision of Sesuvium (Aizoaceae, Sesuvioideae)
Source Systematic Botany
Author Keywords Cypselea halophytes C-4 photosynthesis restoration plant Sesuvium portulacastrum Southern Africa phylogenetic hypothesis portulacastrum caryophyllales diversity classification evolution salt
Abstract Sesuvium and Cypselea are closely related succulent genera within the Sesuvioideae (Aizoaceae). Since Cypselea is nested in Sesuvium in molecular studies and both genera share traits separating them from other members of the subfamily, we propose to include Cypselea in Sesuvium. Sesuvium (incl. Cypselea) comprises 14 species and is distributed worldwide with centres of diversity in southern Africa and North and Central America. Sesuvium comprises erect to procumbent herbs with opposite leaves that often bear conspicuous sheath-like lateral appendages on the petioles (pseudostipules). These and the many-seeded capsules are diagnostic traits, separating Sesuvium from the closely related genera Trianthema and Zaleya. Sesuvium is usually found in coastal or otherwise saline areas and is phylogenetically divided into an African (5 spp.) and an American lineage (9 spp.). While all African species are C-4 plants, the American lineage also comprises a derived C-3 lineage, which includes the cosmopolitan species S. portulacastrum. Some floras provide descriptions and keys for locally relevant species, but currently no comprehensive taxonomic treatment is available for Sesuvium. In this paper, a key and descriptions for all species are provided. Furthermore, we compile information on the rare and poorly known species of the genus and address issues concerning species concepts in Sesuvium, which impede species identification. The inclusion of Cypselea in Sesuvium leads to three new combinations: Sesuvium humifusum, Sesuvium mezianum and Sesuvium rubriflorum.
Author Address [Bohley, Katharina; Kadereit, Gudrun] Johannes Gutenberg Univ Mainz, Inst Allgemeine & Spezielle Bot, D-55099 Mainz, Germany. [Winter, Pieter J. D.] SANBI, Compton Herbarium, Private Bag X7, ZA-7735 Cape Town, South Africa. Bohley, K (reprint author), Johannes Gutenberg Univ Mainz, Inst Allgemeine & Spezielle Bot, D-55099 Mainz, Germany. katbohle@uni-mainz.de
ISSN 0363-6445
ISBN 0363-6445
29-Character Source Abbreviation Syst. Bot.
Publication Date Jan-Mar
Year Published 2017
Volume 42
Issue 1
Beginning Page 124-147
Digital Object Identifier (DOI) 10.1600/036364417x694575
Unique Article Identifier WOS:000396359900013

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