Identity, distribution and possible relationship of Elymus arenosus
DOI:
https://doi.org/10.21248/kochia.v15.131Abstract
Elymus arenosus is controversial in terms of its delimitation, taxonomic assessment and geographical distribution. Whereas some authors consider it an endemic of the Mainzer Sand region in Germany, others regard it as a taxon, often at subspecific rank, more widely distributed along the coasts of northwest Europe. Using plastid trnL-trnF and nuclear ribosomal ITS sequences we aimed at clarifying the identity, geographical distribution and possible relationships of the species. We found that Mainzer Sand material of E. arenosus contains an unique trnL-trnF haplotype, also found in Dutch material (Millingerwaard) identified as E. arenosus, as well as some unique ITS-ribotypes. In combination with its unique morphology and older records. of the species from the upper Rhine valley we conclude that E. arenosus should be treated as a pecies which was more widely distributed along the Rhine in the past. The species has 2n = 28 chromosomes. Molecular and morphological similarities may imply that E. campestris is the closest relative of E. arenosus.
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