The Collaborative International Dictionary of English v.0.48:

melosa \melosa\ n.
   A South American herb (Madia sativa) with sticky glandular
   foliage; it is a source of madia oil.

   Syn: Chile tarweed, madia oil plant, Madia sativa.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

melosa
    n 1: South American herb with sticky glandular foliage; source
         of madia oil [syn: melosa, Chile tarweed, madia oil
         plant, Madia sativa]