Synonyms for Scammonyroot (same or very similar meaning)
WordNet sense 1 (tropical American prostrate or climbing herbaceous perennial having an enormous starchy root; sometimes held to be source of the sweet potato):
man-of-the-earth, manroot, wild potato vine, Ipomoea fastigiata, Ipomoea panurata, wild sweet potato vineFrom the ODE community, based on WordNetadd/edit