Tribulus terrestris is an annual plant in the caltrop family (Zygophyllaceae) widely distributed around the world. It is adapted to thrive in dry climate locations in which few other plants can survive.
Tribulus terrestris
Tribulus terrestris habitus on a beach in the Philippines
"Goathead" fruit
Germinating fruit of Tribulus terrestris
Zygophyllaceae is a family of flowering plants that contains the bean-caper and caltrop. The family includes around 285 species in 22 genera.
Zygophyllaceae