a.k.a Downey BromeCheatgrass
ID Facts: Annual grass. Plants are usually 12 to 18 inches tall
Inflorescence is slender 3/8 to 3/4 inch long, drooping; usually turns purple at maturity.Leaves are flat and covered in soft hairs.
Reproduces from seed. Likes to establish in disturbance areas.The key to eradicating cheatgrass is diligenceā€”once you begin the process you must be persistent and continue follow up treatments for up to four or five years (or however long it might take) because cheatgrass seed may survive in soils this long.
*After maturity cheatgrass becomes a nuisance and a fire hazard.

cheatgrass - fully cured seeds