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Wikipedia says:
The Joshua tree (Yucca brevifolia) is a monocotyledonous tree native to southwestern North America, in the states of California, Arizona, Utah and Nevada. Confined mostly to the Mojave Desert between 400-1,800 m (2,000-6,000 feet), they thrive in the open grasslands of Queen Valley and Lost Horse Valley in Joshua Tree National Park. (...) more....
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