tormentil

noun

1. a low European plant, Potentilla erecta, of the rose family, having small, bright-yellow flowers, and a strongly astringent root used in medicine and in tanning and dyeing.

noun

1. a rosaceous downy perennial plant, Potentilla erecta, of Europe and W Asia, having serrated leaves, four-petalled yellow flowers, and an astringent root used in medicine, tanning, and dyeingAlso called: bloodroot