Ground mexican poppy (Argemone mexicana) is a species of poppy from the Papaveraceae family. It is a hardy, drought-tolerant plant that is native to Mexico, and found often in the western United States and throughout Mexico. It has branched stems and usually extremely prickly. It exudes a yellow juice when cut and produces showy yellow flowers.
All parts of A. mexicana are toxic if consumed by poultry. The plant contains isoquinoline alkaloids, dehydrocorydalmine, jatrorrhizine, columbamine, and oxyberberine. The seeds contain 22-36% argemone oil which contains the toxic alkaloids sanguinarine and dihydrosanguinarine.