Definition of "locoweed" []

• Any of several plants of the genera Oxytropis and Astragalus in the pea family, which are widespread in the western and central United States and cause severe poisoning when eaten by livestock. Also called crazyweed, loco1. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Oxytropis sericea – white locoweed, Wonderland Lake Trail, Boulder, Colorado."
• "Buffalo grass is typical of the American steppe; other typical plants are the sunflower and locoweed."
• "When it happens, I would prefer that they not have driven themselves madder than march hares on a steady diet of mercury and locoweed."