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New Mexico State University http://aces.nmsu.edu/pubs
The perennial locoweeds – crazyweeds (Oxtropis spps.) and loco or milkvetches (Astragalus spp.) – are members of the legume (Fabaceae) family. This large group of legumes is taxonomically very difficult to identify, even by the experienced botanist. Some are poisonous and targeted by livestock producers for herbicide control, especially within the mountains, plains and prairie regions of New Mexico. Locoweed toxicity is complicated, as some members of these taxa produce locoism in horses, cattle, sheep and elk, but others are useful forage plants.
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