Wattieza was a genus of prehistoric trees that existed in the mid-Devonian that belong to the cladoxylopsids, close relatives of the modern ferns and horsetails. The 2005 (publicly revealed in 2007) discovery in Schoharie County, New York, of fossils from the Middle Devonian (about 385 million years ago) united the crown of Wattieza to a root and trunk known since 1870. The fossilized grove of "Gilboa stumps" discovered at Gilboa, New York, were described as Eospermatopteris, though the complete plant remained unknown. Belgian paleobotanist François Stockmans described Wattieza givetiana in 1968 from fossil fronds collected from Middle Devonian strata in the London-Brabant Massif in Belgium. These fossils have been described as the earliest known trees, standing 8 m (26 ft) or more tall, resembling the unrelated modern tree fern. Wattieza had fronds rather than leaves, and reproduced with spores.

Community content is available under CC-BY-SA unless otherwise noted.