Which group of Astragalus varieties are notorious for causing toxicity in grazing livestock?

Answer

Locoweeds

The inherent danger within the vast *Astragalus* genus is highlighted by certain species that pose significant health risks to animals. Specifically, species colloquially known as locoweeds, which are scientifically classified as *Astragalus* varieties, are notorious for the adverse effects they cause when consumed by grazing livestock. This severe toxicity serves as a critical warning that generalizing the safety or efficacy of any plant based solely on the common name 'milk-vetch' is dangerous, necessitating precise species identification before any therapeutic or ecological interaction.

Which group of Astragalus varieties are notorious for causing toxicity in grazing livestock?
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