Boing Boing recently covered a story about the perennial wheat root. You can see that story here. and see Jerry Glover holding the perennial wheat root here:
This was a shorter report on the perennial wheat root which you can find in National Geographic's website here. In short, the roots of perennial wheat are much longer (10 to 12 feet) then most of the wheat species (which are annual plants), most of us grow and consume. Long roots are important for protecting soil from erosion, and keeping important nutrients in the soil, yet are not as popular as perennial wheat plants.