FAMILY: Zygophyllaceae — Caltrop family
OTHER COMMON NAMES: Summer poppy, Orange caltrop
ETYMOLOGY: The genus Kallstroemia was named for Anders Kallström (1733-1812), a Scandinavian botanist, by the physician and naturalist Giovanni Antonio Scopoli.
The specific epithet grandiflora derives from Latin and means 'large flowered'.
Although the common name is Arizona poppy, Kallstroemia grandiflora is not in the poppy family (Papaveraceae).
DESCRIPTION: Arizona poppy's rich orange flowers with the crimson color at the base of each petal give it a striking appearance. The five broad rounded petals are in the shape of a bowl and can be up to 1.5" wide. It has a low, sprawling growth habit, with stems reaching a height to 12" and spreading to a width of up to 4'. The gray-green compound leaves have small oval leaflets. Both the leaves and stem are very hairy.
Arizona poppy is a summer monsoon season species that blooms from July through September. It grows on roadsides, open plains, mesas, and desert slopes below 5,000'.