http://www.floridata.com/lists/grass.cfm

The huge grass family (Gramineae) includes food and forage grasses such as corn, wheat and oats, sod-forming grasses like Bermuda and St. Augustine, and the ornamental grasses. Ornamental grasses include dainty annuals used as accents in flowerbeds and in dried arrangements, tall perennials that demand attention in beds and borders, and tree-sized bamboos that dominate the landscape. Most grasses can be recognized by their elongated, blade-like leaves with parallel veins.