[SK]; Mela & Cajander, 1906
A. J. Melan Suomen Kasvio (5. painos)
[GMBOT]; Robinson & Fernald, 1908
A Handbook of the Flowering Plants and Ferns of the Central and Northeastern United States and adjacent Canada
Gray's Manual Botany (7th Ed.)
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Keep in mind that the taxonomic information is copied from various sources, and may include many inaccuracies. Expert help is welcome.