Comment concerning Hau Kuahiwi (Hibiscadelphus giffardianus): Hau Kuahiwi (Hibiscadelphus giffardianus) - not really the rarest

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As a comment about Hau Kuahiwi (Hibiscadelphus giffardianus), Metrosideros wrote:

Quite notably, the rarest tree on Earth.

It was saved by Ranger W.M. Giffard in the late 1920's from a single dying tree in the wild.

He produced four trees from seed at his country home. From these the National Park Service has produced cuttings and gotten more than a dozen trees cultivated in Kipuka Pua'ulu (Bird Park) & Kipuka Ki in Hawai'i Volcanoes National Park.

The National Park Service continues to cultivate the tree, keeping it from extinction.
Knoxville, TN (Zone 7a)
Region: Tennessee
Feb 16, 2015 12:05 PM CST
While it is very rare, at least for now, it's definitely not the rarest tree on Earth. There are a number of species with only one known specimen in existence. Hibiscadelphus giffardianus is currently growing in at least seven sites/institutions worldwide.

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