Annual Sunflower
Helianthus annuus
Photographed in the bed of the Gila River near Goodyear,Maricopa Co., Arizona. 11 Oct. 2007. This photo is hosted at the Wikimedia Project where there are many more images of sunflowers.
Sunflowers in the Sonoran Desert are mostly associated with ditches near agricultural areas but can also be found in natural riparian habitats. These 'wild-type' sunflowers as compared to the cultivated varieties have smaller heads as are the seeds. As the seeds mature they become a favorite food of House Finches and Lesser Goldfinches.
Sonoran Bumblebee -- Bombus sonorus can be found at flowers of Helianthus annuas