Gratiola viscidula is a relatively uncommon but visually appealing aquatic plant native to North America. It is characterized by its small, serrated, dark green to slightly purplish leaves that grow in opposite pairs along creeping stems. The plant exhibits a compact, low-growing habit, making it suitable for intricate aquascapes where texture and structure are important. Its growth rate is moderate, and it spreads by sending out horizontal runners, gradually forming a dense carpet or mat under favorable conditions.