Carpinus putoensis

Carpinus putoensis (Putuo hornbeam, ) is a species of plant in the family Betulaceae. It is a small tree, up to 15 m tall.

It is endemic to Zhoushan archipelago in China where it survives as a single tree on Putuo Island. It is monoecious, thereby in principle still able to reproduce sexually in the wild. According to Edward O. Wilson, this is an example of what conservation biologists call "living dead" species.