Aralia elata
Scientific Name: Aralia elata
Common Name: Japanese angelica tree
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This non-native invasive tall shrub looks a lot like devil's walkingstick (Aralia spinosa), which is native to the U.S. One difference between them:
Japanese angelica tree has some lateral leaf veins that go straight (or nearly so) to the tips of the serrations ("teeth") along the edge of the leaflets. The native devil's walkingstick has lateral leaf veins that branch again and again and again...
Another difference is that Japanese angelica tree's flower clusters aren't usually at the very top of the tree.