prickly poppy

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of various plants of the genus Argemone, chiefly of tropical America, having large yellow, lavender, or white flowers and prickly leaves, stems, and pods.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun any plant of the genus Argemone having large white or yellow flowers and prickly leaves and stems and pods; chiefly of tropical America
• noun annual Old World poppy with orange-red flowers and bristly fruit