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Nannfeldt, J. A.: Poa Rigens Hartm. versus Poa Arctica R. Br. 1934. (Symbolae Bot. Upsaliensis 3).2 pls. 21 p. - (And:): Nannfeldt, J. A.: On the Polymorphy of Poa Arctica R. Br., with special reference to its Scandinavian Forms. 1940. (Symbolae Bot. Upsal.: IV:3). 19 pls. 85 p.- (And:): Nannfeldt, J. A.: Taxonomical and Plant - Geographical Studies in the Poa Laxa Group. A contribution to the history of the North European Mountain Floras.1935. (Symbolae Bot. Upsal.,5). 3 pls. 113 p. gr8vo. Paper bd. (100591) 49.22
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