|Plants of the family Gramineae characterized by rounded, hollow or pithy jointed stems (culms), and narrow sheathing leaves with parallel veins. The leaves alternate on two sides of the stem. The junction of the blade and sheath often bears an erect fringe of hairs (ligules) and sometimes also earlike projections (auricles). Flowers are borne in reduced spikes (spikelets). Note: The list below are more common types. Visit USDA's Plant Database to learn more.