n.
Plant that breaks away from its roots and is driven about by the wind as a light rolling mass, scattering seeds as it goes.
Examples include pigweed ( Amaranth retroflexus , a widespread weed in the western U.S.) and other amaranths , tumbling mustard, Russian thistle, the steppe plant Colutea arborea , and the grass Spinifex of Indonesian shores and Australian steppes.