Genus Cynancum, commonly known as hound's-tongue, is a genus of flowering plants in the Boraginaceae family. The genus comprises of four species, namely Cynancum auriculatum, Cynancum calycinum, Cynancum loureirii, and Cynancum obovatum. Synonyms for Genus Cynancum include Omphalodes, Cynoglottis, Hyalochaete, and Mertensia. These synonyms were used due to the similarity of the plants and their characteristics. Hound's-tongue is native to Europe, Asia, and northern Africa and has been introduced to North America and Australia. The plant is known for its attractive blue flowers, unique leaves, and its ability to adapt to different soil types.