- reed grass - any of various tall perennial grasses of the genus Calamagrostis having feathery plumes; natives of marshland fens and wet woodlands of temperate northern hemisphere
--1 is a kind of grass
--1 is a member of Calamagrostis, genus Calamagrostis
--1 has particulars:feather reed grass, feathertop, Calamagrostis acutiflora; Australian reed grass, Calamagrostic quadriseta