Anza Borrego Natural History Association posted the following report
Sept. 27, 2012. Ganders Cholla, Cylindropuntia ganderi, is now blooming. This plant usually blooms March through May. But, as a result of the August storms, we now have a September surprise, and individual plants are blooming in and around Borrego Springs. Look for the greenish-yellow flowers, often with red tips. Ganders cholla is the most common cholla found in Anza-Borrego.
DesertUSA has the following wildflower report for Death Valley:
Flowers blooming along Tecopa Rd, and the Old Spanish Trail Hwy lots of grasses from recent rains followed by warm and little wind. Rouge desert gold popping up in and around the hot springs area.
DesertUSA also reported:
Sept. 27, 2012 – Rain hit the deserts last week, this may forecast a good wildflower season in the Mojave and Sonoran Deserts. Many roads have rain damaged in Death Valley, Mojave NP., and Anza Borrego Desert State park Lots of rain in Arizona also. New reports below.