Any plant of the genus Carex, perennial, endogenous, innutritious herbs, often growing in dense tufts in marshy places. They have triangular jointless stems, a spiked inflorescence, and long grasslike leaves which are usually rough on the margins and midrib. There are several hundred species. (Bot.)
a small European singing bird (Acrocephalus phragmitis). It often builds its nest among reeds; -- called also sedge bird, sedge wren, night warbler, and Scotch nightingale.