Res Rustica
Columella, Lucius Junius Moderatus
Columella. On agriculture, Volume 1-2. Ash, Harrison Boyd; Foster, Edward Seymour; Heffner, Edward H., editors. Cambridge, MA; London: Harvard University Press; William Heinemann, Ltd., 1941.
Plus etiam eiusdem radix confusa prodest, vel si montanum trifolium invenitur, quod confragosis locis efficacissimum nascitur, odoris gravis, neque absimilis bitumini, et idcirco Graeci eam ἀσφάλτειον appellant; nostri autem propter figuram vocant acutum trifolium: nam [*]()longis et hirsutis foliis viret, caulemque robustiorem facit,