The most endangered tree in the contiguous United States is most likely a battered old oak hidden deep in a Texas mountain range. Its trunk is scarred by a wildfire. Its limbs are weak from a fungal infection. Its habitat is imperiled by climate change. Scientists only realized the species still existed after stumbling upon the ailing specimen during an expedition this spring. And without swift action, researchers warn, Quercus tardifolia could truly disappear.
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