ipomoea panurata

from WordNet (r) 3.0 (2006)

Ipomoea panurata
    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}]

from The Collaborative International Dictionary of English v.0.48

man-of-the-earth \man-of-the-earth\ n.
   1. (Bot.) A long-rooted morning glory ({Ipomoea leptophylla})
      of Western U. S.

   Syn: man of the earth, {Ipomoea leptophylla}.
        [WordNet 1.5]

   2. A tropical American prostrate or climbing herbaceous
      perennial ({Ipomoea panurata} or {Ipomoea fastigiata})
      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 1.5]