hard wheat

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of several varieties of wheat having hard grains with high protein and gluten content, yielding flour especially suited to making breads.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun wheat with hard dark-colored kernels high in gluten and used for bread and pasta; grown especially in southern Russia, North Africa, and northern central North America