Fiddlenecks (Amsinckia) (Amsinckia)

Fiddlenecks are flowering plants that contain alkaloids and high concentrations of nitrates that can poison grazing livestock, especially cattle. Because of this and their ability to thrive in disturbed soils—incuding grazing and crop lands—everal species are considered noxious invasives. They are named fiddlenecks for their curled flowering stems.