The most abundant terrestrial plant in the world is grass. Grasses belong to the family Poaceae and are found in a variety of environments, from savannas and prairies to wetlands. They play a crucial role in numerous ecosystems, providing habitat and food for various wildlife species. Grasses are also essential for agriculture, as they include staple crops like rice, wheat, and maize, which are vital to human diets worldwide. Their extensive root systems contribute to soil stability and help prevent erosion, making them important for maintaining ecological balance.