Accepted By:
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Böcher, T. W. 1978. Greenlands Flora 326 pp.
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Böcher, T. W., K. Holmen & K. Jacobsen. 1968. Fl. Greenland (ed. 2) 312 pp.
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Moss, E. H. 1983. Fl. Alberta (ed. 2) i–xii, 1–687. University of Toronto Press, Toronto.
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Taylor, T. M. C. 1970. Pacific Northwest Ferns and Their Allies. 247 pp.
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