Argemone pinnatisecta

Argemone pinnatisecta, known as the Sacramento prickly poppy, is an angiosperm and part of the poppy family. A very thorny looking perennial that grows up to a meter and a half in height. The thorny stems are covered in bluish green serrated leaves with spiky tips. The flower buds are also covered in these sharp thin thorns until they open, between May and August, revealing six white petals up to four centimeters long and nine centimeters wide, and a bright yellow anther with various stamens jetting out. The fruits of plant contain black seeds about two millimeters in diameter....read more on Wikipedia.