The Collaborative International Dictionary of English v.0.48:

guama \guama\ n.
   A tropical tree of Central America and the West Indies and
   Puerto Rico (Inga laurina) having spikes of white flowers;
   it is used as shade for coffee plantations.

   Syn: Inga laurina.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

guama
    n 1: tropical tree of Central America and West Indies and Puerto
         Rico having spikes of white flowers; used as shade for
         coffee plantations [syn: guama, Inga laurina]