Tormentil n. (Bot.) A rosaceous herb (Potentilla Tormentilla), the root of which is used as a powerful astringent, and for alleviating gripes, or tormina, in diarrhea.
... there, gold-crests come down from the dark pines opposite—they seem fond of pines—yellow-hammers sit and sing on them, and they are visited all day long by one or other. The little yellow flowers of tormentil are common in the grass as autumn approaches, and grasshoppers, which do not seem plentiful here, sing there. Some betony flowers are opposite on the other sward. There is a marshy spot by one of the bushes where among the rushes various semi-aquatic ... — The Toilers of the Field • Richard Jefferies
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