A Haleakala silversword plant (Argyroxiphium sandwicense macrocephalum) grows in the volcanic rock near the summit of Mount Haleakal? on the Hawaiian island of Maui. The plant, found only in Haleakala National Park, was once endangered and is still considered threatened. It grows more than a mile above sea level (2,100 to 3,000 m) in tough conditions. The skin and hairs are strong enough to resist the wind and freezing temperature of this altitude and protect the plant from dehydration and the sun.
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