: Araucariaceae, Podocarpaceae, Sciadopityaceae, Cupressaceae, Cephalotaxaceae, Taxaceae, and Pinaceae. Gnetophytes : Ephedraceae, Gnetaceae , and Welwitschia. Key Scientific Resources
: Some papers focus on specific traits, such as " Polyploidy in gymnosperms ," which identifies Ephedraceae as the most variable family based on genome size. The Systematics and Evolution of Gymnosperms with ... - PMC
: Ginkgoaceae (consisting of the single living species, Ginkgo biloba ).