American angelica tree ame·ri·ca·nangelicatree uncommon noun 1. small deciduous clump-forming tree or shrub of eastern United States SynonymsAmerican angelica treedevil's walking stickHercules'-clubAralia spinosa Related words Broader terms shrub Parts genus Aralia WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.