Plagiobothrys arizonicus is a species of flowering plant in the borage family known by the common name Arizona popcornflower.

The plant is native to the southwestern United States, California, and Sonora (Mexico).

Plagiobothrys arizonicus is an annual herb with a spreading or erect stem 10 to 40 centimeters in length.

The herbage leaks a staining purple juice when crushed.

[1] The inflorescence is a series of regular bracts and tiny flowers, each five-lobed white corolla less than 3 millimeters wide.