The Collaborative International Dictionary of English v.0.48:

Malaxis-unifolia \Malaxis-unifolia\ n.
   A North American orchid having a solitary leaf and flowers
   with threadlike petals.

   Syn: green adder's mouth, Malaxis ophioglossoides.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Malaxis-unifolia
    n 1: North American orchid having a solitary leaf and flowers
         with threadlike petals [syn: green adder's mouth,
         Malaxis-unifolia, Malaxis ophioglossoides]