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Quercus ellipsoidalis
http://www.fs.fed.us/database/feis/plants/tree/queell/
Information on distribution and occurrence, value and use, characteristics, and fire ecology.
Quercus ellipsoidalis
http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=233501027
Facts on physical characteristics, habitat, and range. Provides distribution map.
Quercus ellipsoidalis (Northern Pin Oak)
http://www.treecanada.ca/trees/species_info.php?species_id=216&lang=en
Images of form, trunk, fruit, leaf, and flower.
Quercus ellipsoidalis (Northern Pin Oak)
http://www.enature.com/partners/nwf/showSpeciesLG_nwf.asp?familyName=&shapeName=&curFamilyID
Physical description, habitat, and range. Includes an image of leaves.