yellow nutsedge

:  a widely distributed weedy sedge (Cyperus esculentus) with small, edible, rapidly produced, nutlike tubers Yellow nutsedge is a perennial grass-like weed with triangular leaves and a yellow-green color. — Richard Burton, Secrets to a Great Lawn, 2001 In one year, a single yellow nutsedge (nutgrass) can produce 1,900 new plants. — Dan Vierria, The Sacramento (California) Bee, 28 Jan. 2006 —called also earth almond, ground almond, rush nut, tigernut