<Table> <Tr> <Td> </Td> <Td> This article may be in need of reorganization to comply with Wikipedia's layout guidelines . Please help by editing the article to make improvements to the overall structure . (March 2016) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article may be in need of reorganization to comply with Wikipedia's layout guidelines . Please help by editing the article to make improvements to the overall structure . (March 2016) (Learn how and when to remove this template message) </Td> </Tr> <P> Grasslands are areas where the vegetation is dominated by grasses (Poaceae); however, sedge (Cyperaceae) and rush (Juncaceae) families can also be found along with variable proportions of legumes, like clover, and other herbs . Grasslands occur naturally on all continents except Antarctica . Grasslands are found in most ecoregions of the Earth . For example, there are five terrestrial ecoregion classifications (subdivisions) of the temperate grasslands, savannas, and shrublands biome (ecosystem), which is one of eight terrestrial ecozones of the Earth's surface . </P> <P> Grassland vegetation can vary in height from very short, as in chalk grassland, to quite tall, as in the case of North American tallgrass prairie, South American grasslands and African savanna . </P>

What ecosystem is flat with many tall grasses