any of various leguminous plants of the genera
of the southwestern U.S. and Mexico, causing locoism in sheep, horses, etc.
any of several perennial leguminous plants of the genera
of W North America that cause loco disease in horses, cattle, and sheep
Collins English Dictionary - Complete & Unabridged 10th Edition
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Animals are allowed to graze in heavy stands of plants that are highly poisonous, such as locoweed or larkspur.
The comparative pathology of locoweed poisoning in livestock, wildlife and rodents.
Native legumes such as purple prairie clover, locoweed, and prairie turnip are abundant in the nitrogen-poor loess soils.