Arrow grass

n.

1.

(Bot.) An herbaceous grasslike plant (Triglochin palustre, and other species) with pods opening so as to suggest barbed arrowheads.

Noun

1.

arrow grass - tufted perennial found in shallow water or marshland; sometimes poisons livestock Synonyms: Triglochin maritima

bog plant, genus Triglochin, marsh plant, swamp plant, Triglochin, Triglochin maritima