Heliotropium convolvulaceum

A sand-dune-dwelling species with large flowers, resembling, as the name suggests, a Convolvulus throughout the southwestern United States and into the western Great Plains.

Plant habit at Samalayuca Dunes, south of Juaréz, Chihuahua, Mexico, 5 Sep 2009. Photographed on a trip with the American Penstemon Society.

Flowering stem at Samalayuca Dunes, 5 Sep 2009.

A flower at Samalayuca Dunes, 5 Sep 2009.

A cauline leaf at Samalayuca Dunes, 5 Sep 2009.