white swallowwort

from The Collaborative International Dictionary of English v.0.48

Swallowwort \Swal"low*wort`\, n. (Bot.)
      (a) See {Celandine}.
      (b) A poisonous plant ({Vincetoxicum officinale}) of the
          Milkweed family, at one time used in medicine; -- also
          called {white swallowwort}.
          [1913 Webster]

   {African swallowwort}, a plant of the genus Stapelia.
      [1913 Webster]