[GMBOT] Robinson, Benjamin, Fernald, Lyndon, 1908
Gray's New Manual of Botany (7th edition); A Handbook of the Flowering Plants and Ferns of the Central and Northeastern United States and adjacent Canada; American Book Company
[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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