Madwort is a name for a plant with yellow flowers that is native to Europe, Asia, and North America. However, if you are searching for synonyms for this term, you may come across several names. Some common synonyms for madwort include foamflower, bistort, persicaria, and knotweed. Some regions may refer to this plant by alternative names, such as jack-jump-up-and-kiss-me and lady's thumb. These plants can act as ornamental ground cover or used in herbal medicines to cure various ailments. Each synonym may reflect a different regional preference, but all refer to the same herbaceous plant that serves multiple purposes.