Original Research

Taxonomy and phylogeny of two subgroups of Pelargonium section Otidia (Geraniaceae). 1. The Pelargonium carnosum complex

M. Becker, F. Albers
Bothalia | Vol 39, No 1 | a231 | DOI: https://doi.org/10.4102/abc.v39i1.231 | © 2009 M. Becker, F. Albers | This work is licensed under CC Attribution 4.0
Submitted: 11 August 2009 | Published: 11 August 2009

About the author(s)

M. Becker, Institut fur Botanik. Schlossgarten 3, D -48149 Munster, Germany
F. Albers, Institut fur Botanik. Schlossgarten 3, D -48149 Munster, Germany

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Abstract

This contribution deals with the taxonomy and phylogeny of the  Pelargonium carnosum complex, a group of closely related taxa of Pelargonium L’Hér. section  Otidia (Sweet) DC. (Geraniaceae) that is distributed in the winter rainfall area of South Africa. According to molecular analyses via AFLP, P. adriaanii M.Becker & F.AIbers,  P. carnosum (L.) L’Uér., P.  ferulaceum (C'av.) Willd. and P. polycephalum (E.Mey. ex Harv.) R.Knuth form a monophyletic clade. Although hybridization may occur between the taxa, three are assigned to specific rank. The fourth taxon, P. ferulaceum is recognized as a subspecies ot'P carnosum. As is implied from the occurrence of morphological intermediates and partly from molecular evidence,hybridization does not only occur among the taxa in this complex but also involves species closely related to this group  (P. panifiorum J.C.Wendl., P. laxum (Sweet) G.Don, P. dasyphyllum R.Knuth). For the taxa in the P. carnosum complex, distribution areas are delineated and diagnostic features that have until now remained obscure, are outlined.


Keywords

amplified fragment length polymorphism (AFLP); distribution; Geraniaceae; hybridization; morphology; <i>Pelargonium carnosum</i> (L.)L’Hér., phylogeny. South Africa; taxonomy; winter rainfall area

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