Wattieza

Wattieza is the earliest known tree.
Their fossils were found in New York State.
They stood 8 m (34 ft) or more tall, and looked like the modern tree ferns.
They lived in the mid-Devonian, about 385 million years ago. They were cladoxylopsids, close relatives of modern ferns and horsetails.
The crown of "Wattieza", discovered in 2005, was united with its root and trunk, known since 1870. The fossilized grove of "Gilboa stumps" had been described as "Eospermatopteris", though the complete plant remained unknown.
"Wattieza" had fronds rather than leaves, and reproduced with spores.