The Collaborative International Dictionary of English v.0.48:

Alpinia \Alpinia\ n.
   1. 1 a genus of perennial rhizomatous herbs of Asia and
      Australia and Polynesia having ginger-scented rhizomes.

   Syn: genus Alpinia, genus Zerumbet, genus Languas.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Alpinia
    n 1: perennial rhizomatous herbs of Asia and Australia and
         Polynesia having ginger-scented rhizomes [syn: Alpinia,
         genus Alpinia, genus Zerumbet, genus Languas]