[FPN] Hitchcock & Cronquist, 1998
Flora of the Pacific Northwest (11th ed.); ISBN 0-295-95273-3
[GFP1] Hutchinson, 1964
The Genera of Flowering Plants; Dicotyledons; Volume 1
[²] This may require parentheses or not. I don't have the necessary information for this taxon.
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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.