Crossword Genius

Illinois and Iowa's trees (4)

Ross

I believe the answer is:

oaks

(Other definitions for oaks that I've seen before include "Acorn producers" , "Mighty ones from little acorns grow" , "Hardwood trees" , "material for shipbuilding" , "Epsom Classic race" .)

I've seen this clue in the King Feature Syndicate.
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