Tribulus is also a derivative Roman era (Latin) name for the weapon known in English today as the caltrop, which bears strong resemblances with the plant today named Latin: Tribulus terrestris or puncture vine.Tribulus is a genus of plants found in many warm regions. The best-known member is T. terrestris (puncture vine), a widespread weed and also the source of a dietary supplement. T. terrestris has been said to raise natural testosterone levels if taken as a supplement.