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Southwestern prickly poppy (Argemone pleiacantha), Sierra Vista, Arizona. These are growing prolifically in disturbed soils on a vacant lot near my home. The flowers are large, up to five inches across (125 cm), and remarkably delicate for such a well-armed spiny plant.

Corona.
Southwestern prickly poppy (Argemone pleiacantha), in Sedona, Arizona.
Corona.
Southwestern prickly poppy (Argemone pleiacantha), in Sedona, Arizona.

Southwestern prickly poppy (Argemone pleiacantha), in Sedona, Arizona.
Southwestern prickly poppy (Argemone pleiacantha), in Sedona, Arizona.