| Family | Scientific Name | Common Name | Habitat | Distribution | Image |
|---|---|---|---|---|---|
| Zygophyllaceae | Kallstroemia californica | Mesquite savannas, other flat, sandy areas, especially disturbed. | Se., s., and w. Texas, New Mexico, Utah, s. Nevada, and California south to n. and c. Mexico. | ||
| Zygophyllaceae | Kallstroemia hirsutissima | Carpetweed | Grasslands and scrub. | E. Texas, New Mexico, and s. Arizona south to n. Mexico. | |
| Zygophyllaceae | Kallstroemia maxima | Greater Caltrop | Disturbed areas, dunes; native status uncertain, probably native in FL peninsula, but probably early introduced in more northern parts of our area from the Neotropics. | South Carolina south to Florida; West Indies; Mexico (Sinaloa and Tamaulipas) south through Central America to northern South America (Venezuela, Colombia). The native status of this species in the se. United States is uncertain; early collections from Charleston (Stephen Elliott) and Savannah suggest the probability of early introduction via ballast, at least north of the Florida peninsula. |  (c) Bradley, Keith |
| Zygophyllaceae | Kallstroemia parviflora | Texas Caltrop | Prairies, roadsides, other disturbed areas. | Kansas west to Nevada, south through Texas, New Mexico, and Arizona to Mexico.; also introduced eastward, as in Mississippi and nw. Louisiana (MacRoberts & MacRoberts 2011a). |  (c) Campos, Aidan |
| Zygophyllaceae | Kallstroemia pubescens | Caribbean Caltrop | Disturbed areas, apparently a waif, not collected in our area since 1898. | Native of tropical America. |  (c) Holt, Sune - CC-BY-NC |