You're not going to see sequoia trees in the Mojave Desert. You'll see Joshua trees there (they look like a very large Yucca). Or are you headed into the desert then up to the Sierras to the sequoias?

map of Southern California

Joshua Tree National Monument Map (a PDF file)

Federal land in California.

Sequoia and Kings Canyon NP Map

Yosemite NP Map

(All of these maps came from here).
SRS