This USDA sponsored site is maintained by the Natural Resources Conservation Service. Their mission is to provide: “a single source of standardized information about plants. This database focuses on vascular plants, mosses, liverworts, hornworts, and lichens of the U.S. and its territories. The PLANTS Database includes names, checklists, automated tools, identification information, species abstracts, distributional data,crop information, plant symbols, plant growth data, plant materials information, plant links,references, and other plant information.”