Grass is any plant of the family Gramineae, having jointed stems, sheathing leaves, and seedlike grains. Grass is most commonly seen in lawns or fields. Grass is an important foodstuff for grazing animals such as cows and sheep. Cereal grains, such as corn and wheat, are considered to be members of the grass family. Grass usually has a green appearance, often with shades of yellow. In times of drought, the color of grass can change to brown.