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World Checklist of Selected Plant Families (WCSP)

Poa williamsii Nash, Bull. New York Bot. Gard. 2: 156 (1901).

This name is a synonym.

Accepted Name: Poa arctica R.Br., Chlor. Melvill.: 30 (1823).
Family: Poaceae
The Poaceae generic classification system originated from the GrassBase database, originally based on Genera Graminum (1985). Work is in progress to update this to a new globally accepted and collaborative generic classification based on the latest research.
Homotypic Names:

Poa arctica subsp. williamsii (Nash) HultÚn, Fl. Alaska Yukon: 202 (1942).

Original Compiler: W.D.Clayton, R.Govaerts, K.T.Harman, H.Williamson & M.Vorontsova