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(Poaceae) in the Eastern Alps: Characteristics and Diatribution

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(Poaceae) in the Eastern Alps: Characteristics and Diatribution ZOBODAT - www.zobodat.at Zoologisch-Botanische Datenbank/Zoological-Botanical Database Digitale Literatur/Digital Literature Zeitschrift/Journal: Phyton, Annales Rei Botanicae, Horn Jahr/Year: 2005 Band/Volume: 45_1 Autor(en)/Author(s): Zernig Kurt Artikel/Article: Phleum commutatum and Ph. Rhaeticum (Poaceae) in the Eastern Alps: Characteristics and Diatribution. 65-79 ©Verlag Ferdinand Berger & Söhne Ges.m.b.H., Horn, Austria, download unter www.biologiezentrum.at Phyton (Horn, Austria) Vol. 45 Fasc. 1 65-79 30. 6. 2005 Phleum commutation and Ph. rhaeticum (Poaceae) in the Eastern Alps: Characteristics and Distribution By Kurt ZERNIG*) With 6 Figures Received May 9, 2005 Key words: Gramineae, Poaceae, Phleum alpinum group, Phleum commu- tatum GAUDIN, Phleum rhaeticum (HUMPHRIES) RAUSCHERT. - Morphology, anther length, determination. - Eastern Alps, Bohemian Forest, Europe. Summary ZERNIG K. 2005. Phleum commutatum and Ph. rhaeticum {Poaceae) in the Eastern Alps: characteristics and distribution. -Phyton (Horn, Austria) 45 (1): 65-79, 6 figures. - English with German summary. The two species of Phleum alpinum group - Ph. commutatum GAUDIN and Ph. rhaeticum (HUMPHRIES) RAUSCHERT - were investigated. They can be differ- entiated morphologically by the presence (Ph. rhaeticum) or absence (Ph. commu- tatum) of ciliae on the awns of the glumes. But this character turned out to be in- sufficient for populations which have one or few ciliae on the base of awns. Some other morphological characters were tested, if and to what extent they provide ad- ditional features to facilitate correct determination. The length of the anthers shows distinct differences between the two species: anthers of Ph. commutatum are (0.6) 0.7-1.2 (1.3) mm long, while those of Ph. rhaeticum measure (1.0) 1.3-2.0 (2.3) mm. Collection sites of more than 1200 revised herbarium specimens are localized and shown in dot maps. Ph. rhaeticum is very common and frequent in the central and southern regions of the Eastern Alps, towards the north it becomes rarer. It prefers pastures in the subalpine and alpine belt. Ph. commutatum, in contrast, grows espe- cially in the alpine belt of the Central Alps, there forming part of the snow-bed ve- getation. Towards the north it becomes more common, where it grows in moderate altitudes from 1500 m upwards. In the Bavarian and Bohemian Forest Ph. commu- tatum occurs exclusively. *) Mag. K. ZERNIG, Abteilung für Botanik, Landesmuseum Joanneum, Rau- bergasse 10, 8010 Graz; e-mail: [email protected] ©Verlag Ferdinand Berger & Söhne Ges.m.b.H., Horn, Austria, download unter www.biologiezentrum.at Zusammenfassung ZERNIG K. 2005. Phleum commutatum and Ph. rhaeticum (Poaceae) in den Ost- alpen: Merkmale und Verbreitung. - Phyton (Horn, Austria) 45 (1): 65-79, 6 Abbil- dungen. - Englisch mit deutscher Zusammenfassung. Die beiden Arten der Phleum alpinum-Gruppe - Ph. commutatum GAUDIN und Ph. rhaeticum (HUMPHRIES) RAUSCHERT - werden untersucht. Sie werden morpholo- gisch durch das Vorhandensein (Ph. rhaeticum) bzw. das Fehlen (Ph. rhaeticum) von Wimpern auf der Hüllspelzengranne unterschieden. Dieses Merkmal stellt sich aber als unzureichend heraus bei Individuen mit einer einzigen oder ganz wenigen Wim- pern an der Basis der Granne. Daher werden einige andere Merkmale daraufhin überprüft, ob und in welchem Ausmaß sie für eine sicherere Bestimmung tauglich sind. Die Länge der Antheren stellt sich bei beiden Arten als deutlich verschieden heraus: die Staubbeutel von Ph. commutatum sind (0,6) 0,7-1,2 (1,3) mm lang, jene von Ph. rhaeticum hingegen (1,0) 1,3-2,0 (2,3) mm. Die Fundpunkte von über 1200 revidierten Herbarbelegen wurden lokalisiert und werden in Punktkarten gezeigt. Ph. rhaeticum ist in den zentralen und südlichen Teilen der Ostalpen häufig, nach Norden hin wird diese Art seltener. Sie bevorzugt nährstoffreiche Weiden in der subalpinen Höhenstufe. Im Gegensatz dazu ist Ph. commutatum seltener, es wächst vor allem in der alpinen Stufe der Zentralalpen - nach Norden hin wird es häufiger, dort wächst es schon in tieferen Lagen ab ca. 1500 m. Im Bayerischen Wald und im Böhmerwald kommt nur Ph. commutatum vor. 1. Introduction Phleum L. sect. Phleum contains four taxa, which have been fre- quently causing heartburn to botanists. Morphologically they can be split up into two distinct groups: The Phleum pratense group, consisting of Phleum pratense L. and Phleum bertolonii DC, and the Phleum alpinum group, comprising Phleum commutatum GAUDIN and Phleum rhaeticum, (HUMPHRIES) RAUSCHERT. The assignment of Phleum populations, both to a group and to a species often involves considerable difficulties. The present paper tries to provide more suitable morphological criteria for an accurate determination of Ph. commutatum and Ph. rhaeticum. While Ph. pratense and Ph. bertolonii differ from each other mainly in size, the crucial morphological feature to distinguish the taxa within the Ph. alpinum group is the absence or presence of ciliae on the glume awns (CONERT 1983, 1985; DOGAN 1991). This character seems to be apparently clear, as it provides - at least theoretically - two sharply defined and mu- tually exclusive conditions. But it turns out to be insufficient for popula- tions that have one or few ciliae on the base of awns. Till now such popu- lations were seen both as Ph. rhaeticum (e. g. ROESSLER 1983) and as Ph. commutatum (e. g. JOACHIMIAK 38; KULA 1996), or it was stated that with today's insight a final decision could not be made (TEPPNER 1980). Ph. rhaeticum can be found in most Central and South European mountain ranges, whereas the area of Ph. commutatum additionally com- prises Scandinavia, the Caucasus, mountain ranges of Central Asia, the ©Verlag Ferdinand Berger & Söhne Ges.m.b.H., Horn, Austria, download unter www.biologiezentrum.at 67 Rocky Mountains in North America and the southern Andes in South America. In the Alps both species grow in subalpine and alpine regions, reaching altitudes up to 2900 m above sea level (CONEET 1985). Until now distribution maps were published mostly for the total Ph. alpinum group (e. g. MEUSEL & al. 1965, HAEUPLER & SCHÖNFELDER 1988), probably due to the difficulties of distinguishing the species. For the same reason wrong identifications are frequent and it is necessary to be aware of erroneous reports in literature. Additional confusion was caused by nomenclatural reasons. Concise History of the Taxonomy of Ph. alpinum Group GAUDIN 1808 distinguished two morphological variants of the alpine timothy grass (in German: Alpen-Lieschgras), which was named Phleum alpinum by LINNE 1753. The first variant, with ciliated awns and more common in the Swiss Alps, he considered as the Linnean Ph. alpinum, whereas the second one, with glabrous awns, was described as a new spe- cies: Ph. commutatum GAUDIN. The existence of these two taxa was broadly accepted, although they have been variously treated as species, subspecies or varieties. HUBBARD 1968 was the first to express doubts as to the identity of Linnean Ph. alpinum as interpreted by GAUDIN. He considered Ph. commutatum as an erroneous name for Ph. alpinum. BOR 1971 realized that the type specimens of Ph. alpinum and Ph. commutatum resemble each other; therefore he proposed to give a new name to Ph. alpinum sensu GAUDIN, or to use an older name if there exists one. KERGUELEN 1975 was conscious of taxonomical and nomenclatorial difficulties concerning Ph. alpinum as he was compiling a catalog of Poaceae from France. Thus, he gave a list of names (Ph. capitatum SCOP., Ph. geniculatum BELL, ex VITMAN, Ph. subalpinum BRÜGGER), which perhaps could be used for the taxon with ciliated awns, but he did not investigate this matter further. Typification of Ph. alpinum was examined in detail by HUMPHRIES 1978. He designated a specimen out of Linnean Herbarium Lapponicum (Fl. lapp. 25), which contains a single plant with glabrous awns, as the lectotype. Since HUMPHRIES accepted the two taxa only on subspecies level, Ph. commutatum GAUDIN became a synonym of Ph. alpinum subsp. alpi- num. For the taxon with ciliated awns the new name Ph. alpinum subsp. rhaeticum HUMPHRIES was introduced. Finally RAUSCHERT 1979 put the taxa on species level, so that the one with ciliated awns nowadays is named Ph. rhaeticum (HUMPHRIES) RAUSCHERT. TO consider these taxa as species, thistaxonomic view is accepted now to a great extent. According to the rules of the International Code of Botanical Nomenclature the cor- rect names are Ph. alpinum L. and Ph. rhaeticum (HUMPHRIES) RAUSCHERT. So we are faced with the situation, that the name Ph. alpinum was applied ©Verlag Ferdinand Berger & Söhne Ges.m.b.H., Horn, Austria, download unter www.biologiezentrum.at 68 to both taxa, a fact that - combined with the difficulties in distinguishing them morphologically - increases confusion. For reasons of clarity, the unambiguous names Ph. rhaeticum und Ph. commutatum are used in this paper and Ph. alpinum is applied to name the species group only. 2. Material and Methods The present study is based on more than 1200 herbarium specimens from the herbaria FI, GJO, GZU, IB, KL, LI, LJU, M, MSB, SZU, U, W, WHB, WU (herbarium acronyms following HOLMGREN & HOLMGREN 1990) and the private herbaria of W. GUTERMANN (Vienna), H. HEIMEL (Graz), R. KARL (Köflach) and H. TEPPNER (Graz). Geographically this study is limited to the Eastern Alps (including Bohemian Forest). Various characters were tested, if and to what extent they are able to improve the morphological differentiation between Ph. commutatum and Ph. rhaeticum. Quantitative analyses of morphological leaf and in- florescence characters and of anther length were performed on herbarium material. The specimens were examined carefully, their collections sites were identified (as far as possible) and geographical coordinates were assigned to them, so that dot maps of the studied taxa could be generated with the help of a Geographic Information System (GIS). A list of all seen speci- mens is deposited in the libraries of the herbaria GJO and GZU.
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