man-of-the-earth

man-of-the-earth

n.
  1. A long-rooted morning glory (Ipomoea leptophylla) of Western U. S. (Bot.)
  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.