[FPN] Hitchcock & Cronquist, 1998
Flora of the Pacific Northwest (11th ed.); ISBN 0-295-95273-3
[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
Ecological Consulting; West Seattle; 206 932-7225; e-mail:Stewart Wechsler
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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.