So Caesar, 'De Bell. Gall.' vi. 17.
Pliny, 'Nat. Hist.' xxiv. 62. Linnaeus has taken selago as his name for club-moss, but Pliny here compares the herb to savin, which grows to the height of several feet. Samolum is water-pimpernel in the Linnaean classification. Others identify it with the pasch-flower, which, however, is far from being a marsh plant.
Suetonius (A.D. 110), 'De xii. Caes.' v. 25.
Pliny, 'Nat. Hist.' xxx. 3.