different between wheatgrass vs cheatgrass

English

wheat +? grass

wheatgrass (usually uncountable, plural wheatgrasses)

Young grass of the common wheat plant, Triticum aestivum, used freshly juiced or dried into powder for animal and human consumption.
A grass of the genus Agropyron, commonly known as crested-wheat grass.

From cheat +? grass (reputedly because farmers felt cheated when wheat yields were lower because of cheatgrass invading their fields).

cheatgrass (countable and uncountable, plural cheatgrasses)

Bromus tectorum, drooping brome, native to Europe, thought to create an ecology prone to annual fires in many US areas.

2006, Thomas Pynchon, Against the Day, Vintage 2007, p. 98:
It took maybe nine or ten years more of westward drift, over the rolling prairie, through the cheatgrass, the sage grouse exploding skyward […]

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