The Collaborative International Dictionary of English v.0.48:

Cajanus \Cajanus\ n.
   a genus of erect densely branched shrubby perennials of Old
   World tropics; naturalized in other warm regions.

   Syn: genus Cajanus.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Cajanus
    n 1: erect densely branched shrubby perennials of Old World
         tropics; naturalized in other warm regions [syn: Cajanus,
         genus Cajanus]