Warty Caltrop

Kallstroemia parviflora, also called small-flowered carpetweed or warty caltrop, is found in the United States, and extends as far south as Central America. From east to west, it can be found from Illinois to Arizona. It is an orange or yellow small-flowered annual, with zygomorphic flowers consistent with the Zygophyllaceae, or creosote-bush family, to which it belongs. Leaves are compound and are 3–6 cm, with 4 pairs leaflets. The stem is pubescent and 30–60 cm. Flowers measure at...