[maps] Warning! The maps are automatically generated from the textual information, and the process does not always produce acceptable result; See about maps for more info.
Some related literature:
[IBT]; Grimm, 1983
The Illustrated Book of Trees
Book of Trees
[GMBOT]; Robinson & Fernald, 1908
A Handbook of the Flowering Plants and Ferns of the Central and Northeastern United States and adjacent Canada
Gray's Manual Botany (7th Ed.)
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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.