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See Hercules' club.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
1. a prickly tree, Zanthoxylum clava-herculis, of the rue family, having a medicinal bark and berries.
2. Also called angelica tree , devil's-walking-stick. a prickly shrub, Aralia spinosa, of the ginseng family, having a medicinal bark and root.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.