Includes 6 orders: Commclinales, Hydrocharitaceae, Restionales, Juncales, Cyperales, Typhales. ****16 families and about 15000 species. Of these, the grass family Graminaceae is the most important group of crop, bamboo, pasture, and lawn plants. Herbs. Leaves with leaf sheaths. Flowers borne in glabrous bracts, consisting of 1 to many florets in a spikelet; perianth reduced to scale-like, setaceous, squamose, or absent; ovary superior, consisting of 2 to 3 carpels, 1-loculed. Includes 2 families: Cyperaceae, Salicaceae, culms 3-angled, solid, node-less, with closed leaf sheaths, leaves 3-seriate, nutty. About 96 genera and 9300 species, widespread in the world, most abundant in the frigid and temperate regions. Common as Scirpus, Cyperus, Carex, Eleocharis, Lepironia . Gramineae and sedge family is similar, but this family plant stems cylindrical, hollow, articulated, leaf sheaths dehiscent, leaves 2 columns, often with ligule, auricles, caryopsis, and thus distinguishable. There are more than 10,000 species in about 750 genera, usually divided into the bamboo subfamily Bambusoideae and the gramineous subfamily Agrostidoideae. the genus Phyllostachys, the genus Oryza, the genus Wheat, the genus Triticum, the genus Barley, the genus Hordeum, the genus Oat, the genus Avena, the genus Saccharum, the genus Sorghum, and so on are all members of this family. ) Sorghum, etc. are economically important plants.