The family Poaceae is named after the Greek word Poa meaning grass. Poaceae or Gramineae is the largest family of monocots. In 1895, John Hendley Barnhart named the family Poaceae. Poaceae or grass family consists of 500 genera and 8000-9000 species. 113 genera and 285 species of this tribe have been identified in Bangladesh. 20% of the earth’s land is covered by this genus of plants.