Cheatgrass is native to Eurasia and the Mediterranean. It was accidentally introduced to the United States in packing material.

Dried seed heads of cheatgrass

Expanse of cheatgrass with dried seed heads
Photo credit: S Dewey/Utah State Univ. (left)
JM Randall/The Nature Conservancy (right)
www.forestryimages.org
Reference
Whitson TD, ed. 2000. Weeds of the West. Jackson (WY): Western Society of Weed Science. 628 p.