Are there mostly 3-5 BLADES that are LOBED or coarsely toothed, with twigs green to purplish-green?
CLUE: The fruit is a double SAMARA. It is a boxelder (ashleaf maple).

OR

Are there mostly 5-13 BLADES with smooth or toothed edges?
CLUE: The fruit is a single SAMARA. These are ash trees.