Philly Tree Map

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Tree Key > Leaves > Simple > Toothed Edge
How are the flowers shaped?
Petaled Flower
Petaled Flower Image
Credit: The Dow Gardens Archive, Dow Gardens, Bugwood.org
Does the flower have petals?
Catkin
Catkin Image
Credit: Norbert Frank, University of West Hungary, Bugwood.org
Is the flower a long, droopy catkin?
Tiny Flower
Tiny Flower Image
Credit: UConn Plant Database Copyright, Mark Brand 1997-2001
Is the flower tiny and inconspicuous?