loco-weed

locoweed

[loh-koh-weed]
noun
any of various leguminous plants of the genera Astragalus and Oxytropis, of the southwestern U.S. and Mexico, causing locoism in sheep, horses, etc.

Origin:
1875–80, Americanism; loco + weed1

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World English Dictionary
locoweed (ˈləʊkəʊˌwiːd)
 
n
any of several perennial leguminous plants of the genera Oxytropis and Astragalus of W North America that cause loco disease in horses, cattle, and sheep

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