Dark blue sky in Joshua Tree National Park after sunset. The name Joshua tree was given by a group of Mormon settlers crossing the Mojave Desert in the mid-19th century. The tree`s unique shape reminded them of a Biblical story in which Joshua reaches his hands up to the sky in prayer. Ranchers and miners who were contemporary with the Mormon immigrants used the trunks and branches as fencing and for fuel for ore-processing steam engines. It is also called izote de desierto Spanish, `desert dagger`. It was first formally described in the botanical literature as Yucca brevifolia by George Engelmann in 1871 as part of the Geological Exploration of the 100th meridian or Wheeler Survey.
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