Morphological variation among Betula nana (diploid), B. pubescens (tetraploid) and their triploid hybrids in Iceland.

@article{Thrsson2007MorphologicalVA,
  title={Morphological variation among Betula nana (diploid), B. pubescens (tetraploid) and their triploid hybrids in Iceland.},
  author={Ae Th Th{\'o}rsson and Snaebj{\"o}rn P{\'a}lsson and Adalsteinn Sigurgeirsson and Kesara Anamthawat-j{\'o}nsson},
  journal={Annals of botany},
  year={2007},
  volume={99 6},
  pages={1183-93}
}
BACKGROUND AND AIMS Introgressive hybridization between two co-existing Betula species in Iceland, diploid dwarf birch B. nana and tetraploid downy birch B. pubescens, has been well documented. The two species are highly variable morphologically, making taxonomic delineation difficult despite stable ploidy levels. Here an analysis is made of morphological variation within each ploidy group with an aim to establishing a reliable means to distinguish the species. METHODS Plant materials were… CONTINUE READING
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