... , Caltrop, Yellow Vine, Goat Head, Devil's Thorn, Devil's Weed, Tackweed, Ground Caltrop, Mexican Sand-burr, Bullhead, Cats Head, Texas ... Middle East. In many places, it is considered a pest weed that grows in vacant lots and on roadsides, but the ... populations have often had a different use for the noxious weed. It is most popularly believed to improve sexual functioning, and ...