Wattieza is the name of a leafless fern-like tree that is believed to be the first known tree. It grew in the area of contemporary New York and was identified from a 385 million-year-old fossil. It is said to be 26 ft tall. ¹⁾.

The oldest known single tree, a Pinus longaeva named Prometheus, from Wheeler Peak in eastern Nevada, United States. It was at least 4,862 years old (likely over 5,000), and the exact age was unknown until the tree was cut down by accident during age measuring in 1965²⁾.

The oldest living organism, Pando, is clonal colony of an individual male quaking aspen (Populus tremuloides) trees, connected with single root system. Spanning over 43 hectares, with estimated weight of 6,000 tonnes, is also the biggest known organism. Colony age is estimated to be even 80,000 years³⁾.