Robert Clarkのインスタグラム(robertclarkphoto) - 11月28日 05時43分

During the Ice Age, Joshua trees thrived across the American Southwest. Now some scientists are predicting that global warming will cause the unusual desert tree to disappear, too — at least in its namesake national park.

Scientists predict that climate change will evict many plants and animals from areas where they have long flourished. Some will be able to migrate to more hospitable climates, but many — like the Joshua tree — face huge obstacles to moving and adapting.

The name Joshua tree was given by a group of #Mormon settlers who crossed the #MojaveDesert 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.
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.
Like most desert plants, their blooming is dependent on rainfall at the proper time. They also need a winter freeze before they will bloom.

Once they bloom, the trees are pollinated by the #yuccamoth, which spreads pollen while laying her eggs inside the flower. The moth larvae feed on the seeds of the tree, but enough seeds are left behind to produce more trees. The #Joshuatree is also able to actively abort ovaries in which too many eggs have been laid. @Robert Clark @thephotosociety

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