Marsh Felwort, also known as Swertia perennis, is a herbaceous plant with bright yellow flowers that grows in wetlands and marshy areas. It is primarily found in Europe and Asia and has been used for centuries for its medicinal properties. In terms of synonyms, Marsh Felwort is sometimes referred to as Felwort or simply Swertia. It is also known as Bitterwort, Yellow Gentian, and Mountain Flax. These names allude to its tastiness, golden color and habitat. Regardless of its name, Marsh Felwort continues to be sought after for its therapeutic qualities, particularly in digestive and anti-inflammatory treatments.