arrow grass

Arrow grass

Ar"row grass`\, n. (Bot.) An herbaceous grasslike plant (Triglochin palustre, and other species) with pods opening so as to suggest barbed arrowheads.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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WordNet
arrow grass

noun
tufted perennial found in shallow water or marshland; sometimes poisons livestock 
WordNet® 3.0, © 2006 by Princeton University.
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