Found in the following dictionaries
OTCWL2014 (NASPA Word List 2014)
"Cheatgrass" Definition
noun
A grass (Bromus tectorum) that is native to Eurasian temperate regions and has become widespread in the grasslands of the western United States. Also called downy brome.
Source: American Heritage Dictionary
An annual weedy Eurasian bromegrass () naturalized in North America.
Source: Merriam-Webster
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