The only plant groups with earlier origins are non-vascular, such as green algae, mosses, liverworts and hornworts. The clubmosses originated about 410 million years ago, long before the dinosaurs, ...

The USDA PLANTS Database provides standardized information about the vascular plants, mosses, liverworts, hornworts, and lichens of the U.S. and its territories. It includes names, plant symbols, ...