[GMB]; Fernald, 1970
A Handbook of the Flowering Plants and Ferns of the Central and Northeastern United States and adjacent Canada. 8th (centennial edn)
Gray's Manual Botany (8th edn)
[GNSP]; Wielgorskaya, 1995
Dictionary of generic names of seed plants
Dict. gen. names seed. pl.
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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.