any of a number of chiefly trailing plants (genus Abronia) of the four-o'clock family, with pink, white, or yellow flowers, found in sandy areas of the W U.S.
See sand verbena in American Heritage Dictionary 4
noun
Any of several herbs of the genus Abronia, of western North America, having fragrant, usually red, yellow, or white flowers that are grouped in long-stalked heads.