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Many of the St-genome polyploids in the
Triticeae.
In a genomic system of classification, Elymus generally includes all of
the StH, StY, StHY, StWY, and StPY tetraploids and
hexaploids. The StHNsNs
octoploid is classified as Pascopyrum.
The E and/or J combinations are usually
classified as Thinopyrum. (Many
authors place J- and E-genome species in Thinopyrum, i.e., do not recognize Lophopyrum as a distinct genus.)
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