W. M.  Bowden, ?Chromosome numbers and taxonomic notes on northern grasses IV. Tribe Festuceae: Poa and Pucinella?, Canadian Journal of Botany, vol. 39, pp. 123-138, 1961.

W. M.  Bowden, ?Chromosome numbers and taxonomic notes on northern grasses II Festuceae?, Canadian Journal of Botany, vol. 38, pp. 117-131, 1959.

W. M.  Bowden, ?Chromosome numbers and taxonomic notes on norhtern grasses III Twenty-five genera?, Canadian Journal of Botany, vol. 38, pp. 541-557, 1960.