You can split up many plants in to individual pieces which will survive.
Clearly that's not what we think.
The Rosa mundi, Rosa Gallica versicolor for example is a mutation that sprouted from a seed before 1581 where Holland was a part of Spain and before Britons started to colonize America. Is a creature relatively easy to find in the specialized market still.
Welwitschia mirabilis is a prehistoric unicorn that somehow managed to survive until today. There is not anything like that thing in the entire planet.