Australian Government. Department of the Environment and Energy.
What Tree Is That? Tree Identification Field Guide
Arbor Day Foundation.
Identification Key to Weeds
University of California. Statewide Integrated Pest Management Program.
Weed Identification Tool
University of California. Cooperative Extension and Agricultural Experiment Station.
Weed Identification Tool
Colorado Weed Management Association.
An Electronic Field Guide
Columbia University; University of Maryland; Smithsonian Institution.
Tree identification mobile app using visual recognition software to help identify
tree species from photographs on their leaves.
Plant Recognition Cards
University of Florida. IFAS. Center for
Aquatic and Invasive Plants.
Includes individual recognition cards available online (can purchase set) by common name and scientific name.
See also: Plant ID Videos.
Guide To The Identification of Japanese
University of Georgia. Center for Invasive
Species and Ecosystem Health. Bugwood Blog.
Prepared by: Alabama Cooperative Extension System. ANR-1457.
This publication provides descriptions and clear pictures of key characteristics
as well as details on how to distinguish several common look-a-like species.
Hawaii's Invasive Plant Species: A Noxious Weed Identification Key
Hawaii Biological Survey.
University of Illinois Plant Clinic
University of Illinois at Urbana-Champaign.
"Provides plant and insect identification,
diagnosis of plant disease, insect, weed and chemical
injury (chemical injury on field crops only)."
University of Illinois at Urbana-Champaign. Illinois Council on Food and Agricultural Research.
Identifying Weeds in Field Crops
Michigan State University. Integrated Pest Management Program.
Weed ID Tool
Michigan State University. Department of Crop and Soil Sciences.
Training: Species Identification
Midwest Invasive Species Information Network.
The invasive species education modules will help you become more comfortable with identifying these species in the field. Each module includes a short ten question quiz at the end to help you assess your newly acquired knowledge.
Missouri Botanical Garden.
"The Kemper Garden Center at the Missouri Botanical Garden has pictures, plant
information, and sources for many natives that are in the horticultural trade.
You can search by scientific or common name. Through their PlantFinder Search
options you can also search by preferred habitat, growth form, use (water plant,
attracts butterflies, dried flowers, etc), and other characteristics, like good
descriptions, and keys to the flowering and non-flowering
plants of Missouri. This
site has a brief key you can click on based on
flower color and leaf arrangement. You can scan
through images to find the plant you are looking
for. The individual plant pages have descriptions
and details illustrated by beautiful close-up photos of plant parts like leaves
and stems, often showing the range of variation that can be found in a single
Missoula County Weed District (Montana).
Includes priority 1, 2, 3 weeds and regulated species.
Montana State University. Center for Invasive Species Management.
Mistaken Identity? Invasive Plants and their Native Look-alikes: an Identification Guide for the Mid-Atlantic (Nov 2008; PDF | 7 MB)
New York Botanical Garden.
Published by the Delaware Department of Agriculture in collaboration with Claude E. Phillips Herbarium at Delaware. State University and Delaware Center for Horticulture
"This publication is a full-color, 62-page booklet. The purpose of the work is
to facilitate correct identification of confusingly similar invasive and native
plant species. Targeted at land managers, gardeners, conservationists, and all
others interested in plants, this booklet covers over 20 invasive species and
their native look-alikes."
Identification and Control of Invasive and Troublesome Weeds in North Dakota
North Dakota State University. Extension Service.
A publication to help land managers properly identify and control noxious and invasive weeds found in the state (Publication W1411; reviewed and reprinted May 2015).
Ohio Perennial & Biennial Weed Guide
Ohio State University. Ohio Agricultural Research and Development Center.
Includes a photo key intended to help the casual user identify a weed. Weeds that look similar are grouped together.
Turf & Weed
North Carolina State University. Center for Turfgrass Environmental Research & Education.
Buffelgrass Identification Guide
Southern Arizona Buffelgrass Coordination Center.
Provides high-quality, high-resolution pictures of buffelgrass at various life stages and various settings and key characteristics for identifying buffelgrass.
Mr. Smarty Plants
University of Texas at Austin. Lady Bird Johnson Wildflower Center.
Weed Identification Guide
Virginia Polytechnic Institute and State University.
Virginia Tech Weed Identification Guide
Virginia Polytechnic Institute and State University. Plant Pathology, Physiology, and Weed Science.
Aides in the identification of common weeds and weed seedlings found throughout Virginia and the Southeastern U.S.
A Field Guide for the Identification of Invasive Plants in Southern Forests (2010)
USDA. FS. Southern Research Station; Bugwood Wiki.
Provides information on accurate identification of 56 plants that are aggressively invading forests of the 13 Southern States. It also lists other nonnative invasive plants that are of growing concern. A companion booklet, “A Management Guide for Invasive Plants of Southern Forests,” explains control recommendations, selective application procedures, and prevention measures for these and other plant invaders.
Nonnative Invasive Plants of Southern Forests: A Field Guide for Identification and Control (2003)
USDA. FS. Southern Research Station; Invasive.org.
Gen. Tech. Rep. SRS–62. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southern Research Station. 93 p.
PLANTS Interactive ID Keys and The PLANTS Database
USDA. Natural Resources Conservation Service. National Plant Data Center.
Also see: Invasive Species & Pests
Plant Identification Tools and Guides
USDA. Natural Resources Conservation Service.
Species Identification Sheets
Natural Resources Conservation Service. Connecticut.
The Connecticut NRCS produced Invasive Species Fact Sheets, which contain identification information and a selection of photographs for each species.
Identify a Noxious Weed
Washington State Noxious Weed Control Board.
King County (Washington) Noxious Weed Control Program - Weed
King County Department of Natural Resources (Washington).
Water and Land Resources Division.
Weed Science Society of America.
Weed Identification Tool
University of Wisconsin.
"The database contains 280 of the most common weeds/invasive
plants found in agricultural, urban, and natural settings
in Wisconsin. The database is organized to ask questions
about the unknown plant, and, based on the user's input,
the website will produce a list of plants (scientific
and common names) along with thumbnail images that match
the information entered."
Identification and Management (DVD)
University of Wisconsin. Cooperative Extension.
This DVD (fee based) captures Jerry Doll's short course on
weeds, complete with 28 lectures, live video of weed
identification, plus video demonstrations of sprayer
calibration, rotary hoeing and cultivation, and safe
handling of pesticides. This
resource will be beneficial to students and professionals
alike. An excellent tool to supplement weed-related
courses at any university, as well as for crop consultants
and anyone else interested in weed identification and