Melilotus officinalis, known as sweet yellow clover, yellow melilot, ribbed melilot[2] and common melilot, is a species of legume native to Eurasia and introduced in North America, Africa, and Australia. [3] Melilotus officinalis can be an annual or biennial plant, and is 120–180 centimetres (4–6 ft) high at maturity. [3] .