Alternate Note:
North American species formerly placed in ~Achnatherum~ have been transferred to ~Barkworthia~, ~Eriocoma~, ~Pseudoeriocoma~, ~Ptilagrostiella~, or ~Thorneochloa~ (see Peterson et al. 2019).
~Achnatherum~ s.s. is considered to be a Eurasian genus.
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