Abronia macrocarpa

Abronia macrocarpa, also known as the large-fruited sand verbena or large-fruit sand verbena, is a rare species of flowering plant in the four o'clock family (Nyctaginaceae). It is endemic to post oak savannas in three counties of eastern Texas. where its current range is limited to Freestone, Leon, and Robertson counties. It inhabits harsh, open sand dunes on savannas, growing in deep, poor soils. It was first collected in 1968 and described as a new species in 1972. It is a federally listed endangered species of the United States....read more on Wikipedia.