Poa used for its genus classification by Carl Linnea, is derived from the Ancient Greek: πόα, póa for fodder. The lawn itself may have originated as a consequence of domesticating livestock and emerged as enclosures within early medieval settlements used for communal grazing, distinct from fields reserved for agriculture. Areas of grass regularly grazed by rabbits, horses, sheep or cattle over a long period of time form a very low tight sward similar to a modern lawn. Forms of this territory re-emerged among European aristocracy as a recreational and decorative space maintained by grazing animals or gardeners. The labor intensive maintenance of the lawn underwent a process of democratization with the invention of the mechanical lawn mower. And became tied to suburban expansion and creation of the household aesthetic, as an important aspect of interaction between the natural environment and the constructed urban and suburban space.