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arrowgrass

noun
  1. either of two species, sea arrowgrass (Triglochin maritima) or marsh arrowgrass (T. palustris), of monocotyledonous perennials having long thin fleshy leaves and spikes of inconspicuous flowers
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Word Origin

C18: named from the shape of the fruits when open
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012