What is "manna grass"

manna grass \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.

n. any of several moisture-loving grasses of the genus Glyceria having sweet flavor or odor [syn: sweet grass]