manna grass n. Bot., Any of several tall slender grasses of the genus Glyceria. They have long loose panicles, have a sweet flavor or odor, and grow in moist places. Nerved manna grass is Glyceria nervata, and Floating manna grass is Glyceria fluitans.
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manna grass
n : any of several moisture-loving grasses of the genus Glyceria
having sweet flavor or odor [syn: sweet grass]