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Title: Taxonomy and adaptive radiation of the Pnigma brome-grasses of Europe
Author: Fraile Martin, Carmen
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 1994
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Perennial species of Bromus (Gramineae) embracing section Pnigma in Europe were investigated. Four groups were compared as a working hypothesis. The objective of this research was twofold: first, to make a formal taxonomic assessment of all the putative taxa and second, to contribute to the understanding of the evolutionary trends occurring among them. In the most recent taxonomic account of this group in Flora Europaea (Smith 1980), 9 species and 8 subspecies were recognised. The final view of the relationship amoung different taxa can be summarised as 24 taxa, 5 species and 19 subspecies. New taxa or combinations were reported, B. parilicus, B. caprinus, B. condensatus subsp. microtrichus, B. condensatus subsp. moellendorffianus, B. riparius subsp. macedonicus, B. cappadocicus subsp. crassipes, B. pannonicus subsp. vernalis, B. erectus subsp. montenegrinus, B. erectus subsp. longiflorus, B. erectus subsp. laxus, and b. erectus subsp. aurouzensis (the latter being a novel subspecies in Pnigna brome-grasses). Several techniques were brought to bear on the problems including: micro and macromorphology, anatomy, cytology, taximetric analysis, as well as the formal herbarium study. Significant results were obtained. The chromosome counts here reported agreed with other researchers' work. The intuitive view of taxonomy of the taxa studied clashed to some extent with the results obtained from the taximetric analysis, probably because of the limited amount of information manipulated by the computer. Nevertheless, greater confidence was felt in the "intuitive" classification than in those generated taximetrically. Research on sheath morphology was also carried out. Different kinds of sheath (used as states of a pivotal taxonomic character) were shown to have different functional characteristics. Thus they may be pivotal characters in explaining the evolutionary divergence of different species groups.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available