Citrus medica, a species of true citrus. The plant has a long and interesting history, being the first contact between citrus, which came from the Far East, and western Judaeo-Christian civilization. A citron, the Etrog, was the “hadar” or “goodly fruit” offering at the ancient Jewish Feast of the Tabernacles. At the time of the first Jewish revolt against Rome in A.D. 66–70, the rebels minted their own coins with the Etrog substituting for Nero's imperial visage.