"[Plin. Nat. 22.16.] - THE LAMIUM: SEVEN REMEDIES.
The variety of nettle, too, which we have already spoken of under the name of “lamium,” the most innoxious of them all, the leaves not having the property of stinging, is used for the cure of bruises and contusions, with a sprinkling of salt, as also for burns and scrofulous sores, tumours, gout, and wounds. The middle of the leaf is white, and is used for the cure of erysipelas. Some of our authors have distinguished the various species of this plant according to their respective seasons; thus, for instance, the root of the autumn nettle, they say, carried on the person as an amulet, is a cure for tertian fevers, if due care is taken, when pulling up the root, to mention the patient’s name, and to state who he is and who are his parents. They say, too, that this plant is productive of similar results in quartan fever: and they pretend that the root of the nettle, with the addition of salt, will extract foreign substances from the body; and that the leaves, mixed with stale axle-grease, will disperse scrofulous sores, or if they suppurate, cauterize them and cause them to fill up with new flesh.”
(The Natural History. Pliny the Elder. John Bostock, M.D., F.R.S. H.T. Riley, Esq., B.A. London. Taylor and Francis, Red Lion Court, Fleet Street. 1855.)

"[Plin. Nat. 27.77.] - THE LEUCE, MESOLEUCON, OR LEUCAS: THREE REMEDIES.
Leuce, a plant resembling mercurialis, has received its name from the circumstance that a white line runs through the middle of the leaf; for which reason also, some give it the name of "mesoleucon." The juice of this plant is curative of fistula, and the plant itself, bruised, is good for carcinomata. It is probably the same plant as that called "leucas," so remarkably efficacious for the venom of all kinds of marine animals. Authors have not given a description of it, beyond telling us that the wild leucas has larger leaves than the other, and has properties more strongly developed: they state also that the seed of the cultivated kind is the more acrid of the two.”
(The Natural History. Pliny the Elder. John Bostock, M.D., F.R.S. H.T. Riley, Esq., B.A. London. Taylor and Francis, Red Lion Court, Fleet Street. 1855.)