Source : Webster's Revised Unabridged Dictionary (1913)

Monotropa \Mo*not"ro*pa\, n. [NL., fr. Gr. ? single + ? turn,
   from ? to turn.] (Bot.)
   A genus of parasitic or saprophytic plants including the
   Indian pipe and pine sap. The name alludes to the dropping
   end of the stem.

Source : WordNet®

Monotropa
     n : leafless fleshy saprophytic plants; in some classifications
         placed in the family Pyrolaceae [syn: {genus Monotropa}]