Hairy caltrop

Kallstroemia parviflora is an annual flowering plant native to the United States and parts of Central America. It belongs to the Zygophyllaceae family, characterized by zygomorphic flowers. The plant has a hairy stem and compound leaves with four pairs of leaflets. Flowers are small, yellow or orange, and measure 1 cm in diameter. The fruit is ovoid and 4 mm in size. It is commonly found in arid environments, particularly near roads and railroads. The species was first described in 1898 by Norton.