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Comments are given on the identity of some populations of allotetraploid Dactylorhiza in southern Norway and their relationships to populations elsewhere in Scandinavia and in continental Europe. The most widespread allotetraploid member of Dactylorhiza in southern Norway is D. majalis ssp. sphagnicola. This subspecies is confined to poor and medium-rich fens dominated by peat mosses, Sphagnum, inComments are given on the identity of some populations of allotetraploid Dactylorhiza in southern Norway and their relationships to populations elsewhere in Scandinavia and in continental Europe. The most widespread allotetraploid member of Dactylorhiza in southern Norway is D. majalis ssp. sphagnicola. This subspecies is confined to poor and medium-rich fens dominated by peat mosses, Sphagnum, in