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Summary A randomized block experiment was laid down to compare the morphology of the tetraploid, pentaploid and hexaploid races of Holcus mollis. No qualitative differences have been found to distinguish the races. Quantitative differences exist, but are not sufficiently large to allow a taxonomic separation. The morphology of the pentaploid mollis is discussed in relation to its possible hybrid origin involving H. lanatus.
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Jones et al. (1962) studied this question.
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