The United States Department of Agriculture's PLANTS DATABASE is now available on the library' webpage. (Library Page > Internet Resources and Searching > USDA Plants Database>. This is the ultimate coverage on plants of any type, ranging from alternative crops to invasive weeds. Each plant's profile provides a plant guide (PDF) and images (leaves, seeds, bark and others). A variety of search options are available including searching by state. This is great resource for both the beginner and the expert. The Natural Resources Conservation Service is the lead agency for this database.