Silphium
Silphium (also known as laserwort or laser), σίλφιον (sílphion) in ancient Greek, is an unidentified plant that was used in classical antiquity as a seasoning, perfume, aphrodisiac, and medicine.
It was also used as a contraceptive by ancient Greeks and Romans. It was the essential item of trade from the ancient North African city of Cyrene, and was so critical to the Cyrenian economy that most of their coins bore a picture of the plant. The valuable product was the plant's resin, called in Latin laserpicium, lasarpicium or laser (the words Laserpitium and Laser were used by botanists to name genera of aromatic plants, but the silphium plant is not believed to belong to these genera).
Silphium was an important species in classical antiquity, as evidenced by the Egyptians and Knossos Minoans developing a specific glyph to represent the silphium plant. It was used widely by most ancient Mediterranean cultures; the Romans, who mentioned the plant in poems or songs, considered it "worth its weight in denarii" (silver coins), or even gold. Legend said that it was a gift from the god Apollo.
The exact identity of silphium is unclear. It was claimed to have become extinct in Roman times. It is commonly believed to be a relative of giant fennel in the genus Ferula. The extant plant Thapsia gummifera has been suggested as another possibility. Another theory is that it was simply a high quality variety of asafoetida, a common spice in the Roman Empire. The two spices were considered the same by many Romans including the geographer Strabo.