The Natural History of Pliny, Volume 4 (of 6)

There is another plant, too, the proper name of which is “onochilon,”2583 but which some people call “anchusa,” others “archebion,” and others, again, “onochelis,” or “rhexia,” and, more universally, “enchrysa.” This plant has a diminutive stem, a purple flower, rough leaves and branches, and a root the colour of blood at harvest-time, though dark and swarthy at other times. It grows in sandy soils, and is extremely efficacious for the stings of serpents, vipers in particular, the roots or leaves of it being taken indifferently with the food, or in the drink. It developes its virtues at harvest-time, more especially: the leaves of it, when bruised, have just the smell of a cucumber. This plant is prescribed, in doses of three cyathi, for prolapsus of the uterus, and, taken with hyssop, it expels tape-worms. For pains in the liver or kidneys, it is taken in hydromel, if the patient shows symptoms of fever, but if not, in wine. With the root of it a liniment is made, for the removal of freckles and leprous sores; and it is asserted that persons who carry this root about them will never be attacked by serpents.

There is another2584 plant, again, very similar to this, with a red flower, and somewhat smaller. It is applied to the same uses as the other; it is asserted, too, that if it is chewed, and then spit out upon a serpent, it will cause its instantaneous death.