The Collaborative International Dictionary of English v.0.48:

maccaroni wheat \maccaroni wheat\ n.
   A type of wheat (Triticum durum) with hard dark-colored
   kernels high in gluten and used for bread and pasta; grown
   especially in South Russia, North Africa, and North central
   North America.

   Syn: durum, durum wheat, hard wheat, Triticum durum,
        Triticum turgidum.
        [WordNet 1.5]