"Monotropa uniflora, also known as the Ghost Plant, Indian Pipe, or Corpse Plant is a herbaceous perennial plant, formerly classified in the family Monotropaceae, but now included within the Ericaceae."
http://en.wikipedia.org/wiki/Monotropa_uniflora

see also:
http://www.fcps.edu/islandcreekes/ecology/indian_pipe.htm