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.

• 疯草一种黄芪属和棘豆属豆科植物，广泛地生长于美国中部和西部，牲畜食用后会引起严重的中毒反应