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Key to the Trees of Wisconsin
8.
Twigs squarish, clearly angled or slightly winged, naturally-occurring
plants very rare in Wisconsins in Milwaukee County, and sometimes
cultivated elsewhere.
8. Twigs round in
cross section or nearly so, not angled. Widespread native
species. These three species can be very difficult to distinguish
for beginners. See the discussion comparing species, in the
text for Fraxinus americana.
