Sedges make up a large family. Most, but not all, are found in swampy, wet or damp locations. A typical flower consists of a single modified leaf (the glume) that covers the seed [see illustration right]. The seed may be absent (an infertile flower), or there may also be anthers (bisexual flower), or there may be anthers only (a male flower), or the bract may be empty. None of the sedges have showy petals. There may be many flowers arranged along a common stalk (a spikelet) and there may be many spikelets (illustration far right). In a few sedges, the seed is contained in a bottle-like bag.