Order Lyginopteridales is a term used in botany that refers to an extinct group of seedless vascular plants that lived during the late Devonian to early Permian periods. Synonyms for this term include order Lyginopterideae, order Lyginodendronales, and order Lyginodendraceae. These synonyms are sometimes used interchangeably but essentially refer to the same group of plants. The Lyginopteridales were characterized by their large leaves, which were often frond-like in appearance, and their ability to reproduce via seeds. These plants had a significant impact on the early evolution of plant life and are still studied today by researchers in the field of paleobotany.