The Collaborative International Dictionary
Lewisia rediviva
Bitterroot \Bit"ter*root`\, n. (Bot.) A plant ( Lewisia rediviva) allied to the purslane, but with fleshy, farinaceous roots, growing in the mountains of Idaho, Montana, etc. It gives the name to the Bitter Root mountains and river. The Indians call both the plant and the river Sp[ae]t'lum.
Usage examples of "lewisia rediviva".
BITTER ROOT is also a common name of Gentiana lutea, or Yellow Gentian, the wellknown bitter, and of Lewisia rediviva or Spathulum, with a starchy, edible root.