[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
[GNSP] Wielgorskaya, 1995
Dictionary of generic names of seed plants
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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.