Big caltrop is a flowering plant native to warm temperate and tropical regions of the world. It can be found in dry grasslands, meadows, and disturbed soils in its range. It is a common weed in much of the world, and can be used for a variety of medicinal purposes. This plant has a round, low-growing habit, with deeply divided leaves and small yellow flowers. Its fruits are small, spiny, green balls that turn brown as they mature.