Spinifex

Spinifex, or PORCUPINE GRASS (Triodia irritans), a very coarse, hard, and spiny grass which grows in tussocks, and in some interior parts of Australia covers hundreds of square miles at a stretch. This grass cannot be eaten by any animal, and as the clumps are three or four feet high they make exploring and travelling very laborious. Horses are badly lamed by the wounds from the spinifex.