man-of-the-earth
man-of-the-earth , noun
1.
(Botany) A long-rooted morning glory (Ipomoea leptophylla) of Western U. S.
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.