Soapweed yucca (Yucca glauca) and dunes, looking north.
Looking north over the dunes. Note the ATV tracks. The shrub stabilizing the dark stubbly dunes is shin oak, Quercus havardii. Each mound is a single plant. They can cover large areas, though generally not protruding more than a couple of feet above the surface of the sand.
A circle in the sand caused by wind blowing a stalk of dead vegetation.