Collinsonia is a genus of perennial herbs that belong to the mint family. Although collinsonia is a unique and specific word, there are some synonyms that can also be used to refer to this herb, including horsebalm, ox-balm, and richweed. Horsebalm is a common name for collinsonia due to its strong aromatic scent that attracts horses. Ox-balm is also a popular name for collinsonia because the herb was historically used to soothe the pain caused by oxen yokes. Richweed is another synonym for collinsonia owing to its traditional use as a medicinal plant for digestive issues and to alleviate swelling.