cup grass

noun

Definition of cup grass 

: any of several grasses constituting a genus (Erichloa) of annual and perennial grasses chiefly of warm or tropical regions especially : a common weedy annual grass (E. contracta) of the eastern and central U.S. that has villous spikelets and the second glume acuminate

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History and Etymology for cup grass

so called from the shape of the callus

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