rolling-grass

from The Century Dictionary.

• noun A grass of the genus Spinifex, so named from the fact that the seeds are borne in globular heads which fall at maturity and are driven by the wind over the sands, shedding their seeds, or are carried by the waves and deposited upon newly formed sand-bars. S. hirsutus, the spiny rolling-grass, is regarded in New South Wales as extremely valuable for fixing shifting sands, but is of no value for forage.