What is the rarest and or most endangered plant on the earth?

Subquestions:


1)Found in endemic or wild surrounding.


2)In botanical gardens or collections.


3)What is the rarest sample of any plant, alive or dead?

What is the rarest and or most endangered plant on the earth?
the world's rarest plant is arguably Encephalartos woodii, a cycad, of which only one specimen has ever been found growing wild in South Africa. it has disappeared and the species now only exists in botanical gardens

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