Note 637 — BOOK XXV. THE NATURAL HISTORY OF THE WILD PLANTS.
John Bostock translation
So called probably from a king Eupator. Sprengel and Desfontaines identify it with the Agrimonia eupatorium, but Fée prefers the Eupatorium cannabinum of Linnæus, relying upon the description given by Dioscorides. B. iv. c. 41.