"[Plin. Nat. 25.39.] - TWO VARIETIES OF THE PLANTAGO: FORTY-SIX REMEDIES.
The physician Themiso, too, has conferred some celebrity upon the plantago, otherwise a very common plant; indeed he has written a treatise upon it, as though he had been the first to discover it. There are two varieties; one, more diminutive than the other, has a narrower and more swarthy leaf, strongly resembling a sheep’s tongue in appearance: the stem of it is angular and bends downwards, and it is generally found growing in meadow lands. The larger kind has leaves enclosed with ribs at the sides, to all appearance, from the fact of which being seven in number, the plant has been called “heptapleuron” by some. The stem of it is a cubit in height, and strongly resembles that of the turnip. That which is grown in a moist soil is considered much the most efficacious: it is possessed of marvellous virtues as a desiccative and as an astringent, and has all the effect of a cautery. There is nothing that so effectually arrests the fluxes known by the Greeks as “rheumatismi.””
(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.)