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| Author(s): | Duyvendak, R.;
Luesink, B.;
Vos, H. |
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| Author Affiliation: | Rijksinstituut voor het Rassenonderzoek van Cultuurgewassen - RIVRO, The Netherlands |
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| Title: | Delimitation of taxa and cultivars of red fescue (Festuca rubra L. sensu lato) |
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| Source: | Rasen, Grunflachen, Begrunungen. Vol. 12, No. 3, September/October 1981, p. 53-62. |
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| Publishing Information: | Bonn-Bad godesberg, Hortus Verlag |
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| # of Pages: | 10 |
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| Keywords: | TIC Keywords: Festuca; Cultivar identification; Morphology; Plant anatomy; Agrostology; Taxonomy; Festuca rubra subsp. commutata; Festuca rubra subsp. rubra
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| Abstract/Contents: | "Red fescue (Festuca rubra L. s.l.) is a widely distributed cross-fertilizing species represented in nature by different ecotypes. It is also a cultivated species of which in the EEC more than 10 million kg of seed is produced each year. A cultivated species is not bound by natural borders so that the relation with the original distribution pattern gets lost. Latin species names are internationally used in education, legislation, agricultural research and seed trade. This presupposes that normally developed plants must be identifiable as to their species names under a broad scale of circumstances. Consequently, in particular in cross-fertilized species, a wide morphological species concept is required whereby the delimitation between the species is based on a clear discontinuity in two or more morphological characters. On the other hand subspecies are conceived as taxa with a certain ecological/geographical area showing some morphological intergradation. One can observe an inflation in rank in literature when within Festuca rubra L. s.l. some micro species are distinguished e.g. Festuca nigrescens and F. diffusa. The morphological species concept has not been respected to a sufficient degree. A uniform and stable Latin nomenclature is pursued in practice with help of the ISTA List of Stabilized Plant Names. A cultivar is a group of plants which is distinct, sufficiently uniform (defined in relation to its way of reproduction) and stable. Cultivars are distinguished on morphological and physiological characters, including chromosome number. For practical purposes the cultivars of red fescue are at present divided into three groups, viz.: hexaploid non-creeping red fescue, hexaploid creeping red fescue, and octoploid creeping red fescue. The borderline between non-creeping and creeping is not sharp since there is a continuum in the proportion of intravaginal and extravaginal shoots. With the exception of chromosome number all investigated characters show continous series and the borderlines between the cultivar groups do not coincide with a discontinuity in a morphological character. On the basis of the morphological characters the chromosome number of a creeping red fescue plant cannot be predicted. Since apparently none of the cultivar groups coincides with a certain taxon no Latin name can be associated with a cultivar group. On the basis of an ecological/geographical subspecies concept the following subspecies can be designated in the Dutch habitats. Festuca rubra subsp. commutata, Gaud., Festuca rubra subsp. litoralis, (G. F. W. Meyer) Auquier, Festuca rubra subsp. arenaria (Osbeck) Richter. Further research is necessary to elucidate the taxonomic position of e.g. Festuca rubra subsp. planifolia (Hackel) Hayek. The fact that several taxa show character combinations not yet represented in the cultivars offers perspectives for plant breeding." |
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| Language: | English |
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| References: | 27 |
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| Note: | Abstract appears in German, English, and French
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Duyvendak, R., B. Luesink, and H. Vos. 1981. Delimitation of taxa and cultivars of red fescue (Festuca rubra L. sensu lato). Rasen Turf Gazon. 12(3):p. 53-62. |
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