Pennsylvanica: Answers to key questions in Budd's Flora leading to this species. 

	body or seed of samara almost circular in cross section; NOT [body or seed of samara flattened]
	wing extending halfway down body of seed; NOT [wing extending to bottom of seed]

Oleaceae: Answers to key questions in Budd's Flora leading to this family. 

	shrubs or trees; NOT [herbs]
	plants not climbing
	leaves pinnately compound; NOT [leaves simple]
	leaflets mostly 5-11; NOT [leaflets mostly 3-5]
	flowers not in catkins or aments; NOT [male flowers, at least, in catkins or aments]
	flowers with only one floral ring, with sepals but not petals
	fruit without a feathery style; NOT [fruit with a persistent feathery style]
	fruit a single samara; NOT [fruit a double samara]