Caltrop (Kallstroemia) is a biological genus in the family Zygophyllaceae (Caltrop) and order Zygophyllales.
Kallstroemia maxima
Kallstroemia californica
Kallstroemia pubescens
Kallstroemia hirsutissima
Kallstroemia grandiflora
Kallstroemia perennans
Kallstroemia parviflora
Zygophyllum
Kallstroemia
Larrea
Fagonia
Guaiacum
Bulnesia
Tribulus