Oxytropis Lambertii, commonly known as the Lambert locoweed, is a species of flowering plant native to North America. Locoweed is a term used for plants that are known to cause toxicity in livestock, especially sheep and cattle. However, there are several synonyms for Oxytropis Lambertii that are used in scientific literature and agricultural research, including Astragalus lambertii, Astragalus oxytropis, Oxytropis argophylla, and Arthroprora lambertii. While the plant is known for its poisonous effects on livestock, it has also been used in traditional medicine by Indigenous communities for its purported healing properties. Understanding the various names for this plant can aid in effective research and communication regarding its properties and effects.