A Yucca brevifolia (Joshua tree) near the Wee Thump Joshua Tree Wilderness south of Las Vegas. Here's a funny story: When German immigrants settled in the Mojave desert near the San Andreas fault at the base of the Sierra Pelona Mountains they called their settlement "Palmdale." They had heard that there were palm trees in SoCal. Having never seen a palm tree they mistook the Joshua trees for palm trees hence the town's name.