[FPN] Hitchcock & Cronquist, 1998
Flora of the Pacific Northwest (11th ed.); ISBN 0-295-95273-3
[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
[GNSP] Wielgorskaya, 1995
Dictionary of generic names of seed plants
[IBT] Grimm, 1983
The Illustrated Book of Trees
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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.