Hornwort, also called rigid hornwort, coontail, and coon’s tail, is an underwater, free-floating aquatic plant that can be found in bodies of water on every continent except Antarctica. Hornwort grows in bunches of 6 to 12 stalks connected at a single root. These long stems are covered in a feathery whorl of thin, green leaves that more closely resemble needles. The bushy growth of these leaves resemble the tail of a raccoon, hence its nickname. These plants range in color from light to dark green depending on environmental conditions.