The headache plant is a mid-sized tree that is a member of the Verbenaceae family. It usually grows up to a height of anything between 2 meters and 5 meters and is found in sites where there is fresh and salt water. The headache plant produces smooth, rounded leaves that are quite broad. Often the blades grow up to 15 cm and usually have a vivid green color. The leaves have a distinct midrib and their veins are elevated and found on the underside.