Tripterocalyx micranthus

Tripterocalyx micranthus is a species of flowering plant in the four o'clock family known by the common names smallflower sandverbena and small-flowered sand-verbena. It is native to North America, where it is known from southern Alberta and Saskatchewan through a section of the central United States toward the desert southwest in California, Arizona, and New Mexico. It can be found in several types of habitat, including sandy and scrubby desert regions and sagebrush....read more on Wikipedia.