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Dryopteris affinis: A New Treatment for a Complex Species in the European Pteridophyte Flora

C. R. Fraser-Jenkins
Willdenowia
Bd. 10, H. 1 (Aug. 12, 1980), pp. 107-115
Stable URL: http://www.jstor.org/stable/3995903
Page Count: 9
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Dryopteris affinis: A New Treatment for a Complex Species in the European Pteridophyte Flora
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Abstract

The apomictic species Dryopteris affinis (Lowe) Fraser-Jenkins, ranging from Macaronesia and Morocco through Europe to the Caucasus and the Caspian coast in Iran, is divided into six partly sympatric subspecies based on their morphology, a diploid and five triploids. Most of these have been known for some time but were invalid or at unsuitable rank; evidence suggests that they may contain different combinations of genomes, thus explaining their marked morphological distinction. The subspecies are: subsp. affinis, which is diploid; and subsp. borreri, subsp. robusta, subsp. stilluppensis, subsp. coriacea, and subsp. persica, which are triploid. A number of varieties are treated which are probably of less taxonomic significance, and most are thought to have arisen because of the apomictic nature of D. affinis. D. cebennae, a plant formerly described as a hybrid, is now referred to as a species.

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