Argemone pleiacantha
 Argemone pleiacantha is a species of flowering plant in the poppy family known by the common name southwestern prickly poppy. It is native to Arizona and New Mexico in the United States and Chihuahua and Sonora in Mexico where it occurs in dry woodlands and slopes of foothills and mountains. It is an annual or perennial herb with branching erect stems up to 1.5 meters tall. The plant is covered in prickles often densely. The blue-green leaves are divided into sharp toothlike lobes.