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barn grass

noun

barnyard grass

noun
1.
a weedy, coarse grass, Echinochloa crus-galli, having a spikelike cluster of flowers.
Also called barn grass.
Origin
1835-1845
1835-45, Americanism
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Encyclopedia Article for barn-grass

barnyard grass

(Echinochloa crus-galli), coarse annual grass of the family Poaceae (Gramineae) and one of about 20 species comprising the genus Echinochloa. The common name also applies to a similar species, E. muricata, not considered a separate species by some authorities.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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