Genus Rhynia is a prehistoric plant genus that existed during the Early Devonian period, approximately 400 million years ago. The genus is notable for its morphology, which includes slender upright stems and dichotomous branching. Synonyms for the term Genus Rhynia include Rhynia Major, Rhynia Minima, Rhynia Gwynne-Vaughanii, and Rhynia Sinclairii. These synonyms refer to different species within the genus and are used to differentiate between them. Despite their different names, all species within the Genus Rhynia have similar features, making them unique and fascinating to study for researchers and paleontologists seeking to understand the evolution of early land plants.