Global Plants is the world’s largest database of digitized plant specimens and a locus for international scientific research and collaboration.

Part of the Illinois Natural History Survey, there are three herbaria housed at the Robert Evers Laboratory: Illinois Natural History Survey Herbarium (ILLS), the University of Illinois Plant Biology Herbarium (ILL), and the University of Illinois Crop Evolution Laboratory Herbarium (CEL). Together, these collections contain over 1,200,000 specimens making this the second largest herbarium in Illinois and the 10th largest in the United States.

Photographs taken by the Agricultural Research Service Information Staff. Images of nature (animals, insects, food, etc.) and field research conducted by this department.

The American Phytopathological Society processes thousands of scientifically peer-reviewed images showing disease symptoms, pests, and other disorders associated with plants and crops through its book- and journal-publishing programs. APS images are useful for teaching, training, and diagnostics.

Bugwood Images is a grant-funded project that was started in 1994 by the University of Georgia’s Center for Invasive Species and Ecosystem Health. It provides an easily accessible archive of high quality images for use in educational applications. It is made up of five major website interfaces. These are ForestryImages, IPMImages, InsectImages, WeedImages, and Invasive.org.

Over 500,000 images of plants, fungi, fossils, animals, and people searchable by scientific or common name, location, photographer, and other fields.

Almost 2,400 images of plants, searchable by scientific or common name. Users can also browse by date of contribution or contributors.

Photographs organize hierarchically by plants, such as alfalfa, corn, and soybean.

Over 350 photographs of mushrooms and other fungi, arranged alphabetically.

Designed to assist botanists, ecologists, natural resource managers, educators and hobbyist with the identification of plants commonly found in the southern Great Plains. The Plant Image Gallery includes numerous images of each plant species for your ease in their identification.

From the College of Agricultrual & Environmental Sciences Extension program, this collection includes images of plant disease organized by the plant.

Including the Botany Teaching Collection and the Botany Collection, these collections contain research and teaching materials used at UW Madison. Filter their collections to "botany" to find them both.

Special Collections houses rare books, manuscript collections, nursery and seed trade catalogs, photographs, and posters from the 1500s to the present. Materials cover a variety of agricultural subjects including horticulture, entomology, poultry sciences, natural history, and are not limited to domestic publications. As part of the United States Department of Agriculture (USDA) and the Agricultural Research Service (ARS), Special Collections at the National Agricultural Library is charged with arranging, describing, preserving and making available rare materials significant to the history of agriculture and the USDA. USDA also maintains digital collections, separate from the special collections.

The 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, checklists, distributional data, species abstracts, characteristics, images, crop information, automated tools, onward Web links, and references. This information primarily promotes land conservation in the United States and its territories, but academic, educational, and general use is encouraged. Over 50,000 images of plants are available.

Images of common North American weeds, herbs, and plants.

The Morton Arboretum, the Field Museum of Natural History, and the Chicago Botanic Garden have collaborated to develop this online, searchable database that provides plant specimen data for over 120,000 plant species in the Chicago region.

Focused around the Great Lakes drainage basin, this collection includes 132 herbaria from Illinois, Indiana, Michigan, Minnesota, Ohio, and Wisconsin. Users can search or browse, and the site also includes a crowdsourcing component and a fun plant-of-the-day quiz to test your knowledge!