Melilotus Officinalis, known as the yellow sweet clover, yellow melilot, ribbed melilot or common melilot is a species of legume native to Eurasia and introduced in North America, Africa and Australia. It is biennial plant is 4–6 feet (1.2–1.8 m) high at maturity. The plant has a bitter taste. It blooms in spring and summer. Flowers are yellow. Its characteristic sweet odor, intensified by drying, is derived from coumarin.