spinifex

 A genus of chiefly Australian grasses, the seeds of which bear an elastic spine. Spinifex hirsutus (black grass) and Spinifex longifolius are useful as sand binders. Spinifex paradoxusis a valuable perennial fodder plant. Also, a plant of this genus.  [Webster 1913 Suppl.]

 Any of several Australian grasses of the genus Tricuspis, which often form dense, almost impassable growth, their leaves being stiff and sharp-pointed.  [Webster 1913 Suppl.]