[GMB] Fernald, 1970
Gray's Manual of Botany (8th edition); A Handbook of the Flowering Plants and Ferns of the Central and Northeastern United States and adjacent Canada
[RK] Hämet-Ahti, L., Suominen, J., Ulvinen, T. & Uotila, P. (eds), 1998
Retkeilykasvio (Field Flora of Finland); Ed. 4. 656 pp.; Finnish Museum of Natural History, Botanical Museum. Helsinki
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