Ericameria nauseosa (= Chrysothamnus nauseosus ) (common name Rabbitbrush).

Source: http://data2.itc.nps.gov/nature/photos/environmental%20factors%20Rabbitbrush%20in%20bloom,%20gila%20wilderness,%20oct%2003%20by%20Andrew%20Herzik.jpg

Photo credit: Andrew Herzig

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