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Taxonomic Revision of Geranium Subsect. Mediterranea (Geraniaceae)

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Abstract:

subsect. (Geraniaceae) consists of ten species. The highest diversity of the group is located in the Caucasus and neighbouring areas of Turkey and Iran, with five endemic species. Other species reach western Europe and northwestern Africa. In contrast to the current literature, we consider and subsp. to be synonyms of . A univariate morphometric study revealed some valuable quantitative characters useful for the identification of these species. Micromorphological features of pollen, stigmas, seeds, and mericarps were investigated by SEM. A new key is provided, as well as new and detailed descriptions. is here illustrated for the first time. Eleven lectotypes are designated, and distribution maps are presented. Maximum parsimony and Bayesian analyses of chloroplastic and ribosomal nuclear ITS regions suggest that sect. is monophyletic. Two clades are recovered, one including the annual species and other with the perennials, in which (subsect. ) emerges within a paraphyletic subsect. .

Spanish
Geranium subsect. Mediterranea (Geraniaceae) está formada por diez especies. El Cáucaso es la región más rica con cinco especies endémicas, pero alguna alcanza incluso el oeste de Europa y noroeste de África. En este estudio consideramos G. montanum, y G. ibericum subsp. jubatum como sinónimos de G. ibericum. Un análisis morfométrico permitió evaluar los caracteres cuantitativos y seleccionar los más adecuados para la clave de identificación. Se investigaron también las características micromorfológicas del polen, el estigma, la semilla y el mericarpo. Se presenta una nueva clave, así como nuevas y detalladas descripciones y mapas de distribución para cada una de las especies y se eligen once lectótipos. Geranium kurdicum es aquí dibujado por primera vez. Análisis de máxima parsimonia y bayesianos de las regiones ITS ribosómica nuclear y trnL-trnF cloroplástica sugieren que la sect. Mediterranea es monofilética. Se recuperan dos clados principales, uno con las especies anuales y otro con las perennes entre las que se incluye G. tuberosum (subsect. Tuberosa) dentro de una subsect. Mediterranea parafilética.

Keywords: BIOGEOGRAPHY; ITS; MORPHOLOGY; PHYLOGENY; TAXONOMIC REVISION; TRNL-TRNF

Document Type: Regular Paper

DOI: http://dx.doi.org/10.1600/036364407780360111

Publication date: January 1, 2007

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