"[Plin. Nat. 25.58.] - THE ECHIOS; THREE VARIETIES OF IT: TWO REMEDIES.
Of the echios there are two kinds; one of which resembles pennyroyal in appearance, and has a concave leaf. It is administered, in doses of two drachmæ, in four cyathi of wine. The other kind is distinguished by a prickly down, and bears small heads resembling those of vipers: it is usually taken in wine and vinegar. Some persons give the name of “echios personata” to a kind of echios with larger leaves than the others, and burrs of considerable size, resembling that of the lappa. The root of this plant is boiled and administered in vinegar. Henbane, pounded with the leaves on, is taken in wine, for the sting of the asp in particular.”
(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. 27.22.] - ALCIBIUM : ONE REMEDY.
I have not found it stated by authors what kind of plant alcibium is; but the root, I find, and the leaves, are pounded and employed, both externally and internally, for injuries inflicted by serpents. When the leaves are used, a handful of them is bruised in three cyathi of undiluted wine: the root is employed in the proportion of three drachmæ to the same quantity of wine.
(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.)