caa a22 4500 477038654 CHVBK 20180405111311.0 cr unu---uuuuu 170330e19960901xx s 000 0 eng 10.1007/BF00983512 doi (NATIONALLICENCE)springer-10.1007/BF00983512 Röser Martin Institut für Botanik, Rennweg 14, A-1030, Wien, Austria aut Ecogeography of the grass genus Helictotrichon ( Poaceae: Aveneae ) in the Mediterranean and adjacent regions [Elektronische Daten] [Martin Röser] The geographical distribution of the grass genusHelictotrichon in the Mediterranean Region is analysed and mapped for 33 taxa. Based on only a single life form (perennial herb), a variety of edaphically, climatically and altitudinally differently adapted species complexes has evolved in the area. Most of these complexes show west-east disjunctions and contain geographically, sometimes even edaphically vicarious taxa with complementary distribution. A transition from mesomorphic to xeromorphic habit occurred independently in different species groups and led to the establishment of the "modern” Mediterranean taxa which are in part highly polyploid derivatives of more mesophilic diploids. The significance of polyploidy, patterns of parapatric and sympatric distribution, biogeographical borders, and centres of species diversity are discussed in context with the history of the Mediterranean vegetation. New combinations are:Helictotrichon setaceum subsp.petzense, H. pratense subsp.lusitanicum, H. praetutianum. Springer-Verlag, 1996 Poaceae nationallicence Aveneae nationallicence Helictotrichon nationallicence Avenula nationallicence Ecology nationallicence biogeography nationallicence chromosome numbers nationallicence polyploidy nationallicence Mediterranean Region nationallicence Plant Systematics and Evolution Springer-Verlag 203/3-4(1996-09-01), 181-281 0378-2697 203:3-4<181 1996 203 606 https://doi.org/10.1007/BF00983512 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00983512 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Röser Martin Institut für Botanik, Rennweg 14, A-1030, Wien, Austria aut NATIONALLICENCE 773 0- Plant Systematics and Evolution Springer-Verlag 203/3-4(1996-09-01), 181-281 0378-2697 203:3-4<181 1996 203 606 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer