Wordnet 3.0
NOUN (1)
1. 
 tropical American prostrate or climbing herbaceous perennial having an enormous starchy root; 
 sometimes held to be source of the sweet potato; 
[syn: wild potato vine, wild sweet potato vine, man-of-the-earth, manroot, scammonyroot, Ipomoea panurata, Ipomoea fastigiata]
WordNet (r) 3.0 (2006):
wild potato vine
    n 1: tropical American prostrate or climbing herbaceous
         perennial having an enormous starchy root; sometimes held
         to be source of the sweet potato [syn: wild potato vine,
         wild sweet potato vine, man-of-the-earth, manroot,
         scammonyroot, Ipomoea panurata, Ipomoea fastigiata]