Lots of plants live in Death Valley!
According to the Wikipedia entry on Death Valley:
"Death Valley is one of the hottest and driest places in North America, yet it is home to over 1,040 species of plants, and 23 species are endemic-found nowhere else in the world."
Two of the more common plants in Death Valley are the creosote bush, Larrea tridentata
and mesquite, Prosopis spp.
The National Parks Service has more information on the plants of Death Valley
Cacti & Succulents