Chamaesyce carunculata

A sand-dune-dwelling annual with large fruits, uncommon in the United States from southeastern New Mexico to western Oklahoma & western Texas.

Plant habit at Samalayuca Dunes, south of Juaréz, Chihuahua, Mexico, 5 Sep 2009.

A flowering stem at Samalayuca Dunes, 5 Sep 2009.

A cyathium at Samalayuca Dunes, 5 Sep 2009.

Another flowering stem at Samalayuca Dunes, 5 Sep 2009.