Arguably the rarest tree in the world, at least in the wild, the Wollemi Pine. There is a handful of specimens still alive, all genetically identical. Zero genetic variation in the population means they all come from the same tree.

You can buy them in a nursery, because after its discovery in 1996 the NSW Botanic Gardens set about growing it in quantity through nurseries, to reduce the risk of people looking for the few trees in the wild. It was only previously known from the fossil record.

This is the bark on an immature tree 3.93 metres high, from the NSW Botanic Gardens.