- An excellent resource with fact sheets for 900+ species, several ID keys, a scientific name quiz feature, a street tree selector, and more.
- Up to date information on the taxonomy of both native and invasive species. Information on species characteristics, habit, range, etc. Includes photographs for many species and links to other sites.
- Articles containing a wealth of information for most tree species of North America, with extensive lists of relevant scientific literature.
- Information on distribution and range, management considerations, ecological and biological considerations, and fire ecology and fire effects for many North American tree species.
- Great information about all the world's gymnosperms, including range maps, descriptions, big tree locations, and more.
- An effective app that helps ID woody plants and other taxa live using your camera on a phone or tablet.
- A PDF text produced by the USDA Forest Service's Southern Research Station. Many nice photos and good info on the most common invasive species.
- A collaboration between the NPS and UGA, this site has photos, information, and county-level maps for most of the invasive plant species found in the US.
- A PDF text produced by the MS Forestry Commission. Common species are well described, although photos are lower-resolution.
- A PDF text produced by the USDA Forest Service's Forest Health Technology Enterprise Team. Descriptions, photographs, range maps, and several useful keys for oaks.
- Photos and information for vascular plants found in the Pineywoods of East Texas.
- Many links to forestry topics in Texas.
- A brief description of the history of some common ecosystems found in the Pineywoods region of East Texas.
- Maintained by the the Lady Bird Johnson Wildflower Center, this site contains information on many useful ecological attributes for most woody species in the state. Searchable by location and ecoregion.
- The Texas Forest Service's site includes detailed drawings and brief descriptions of ~150 species and some other general dendrology related information.
- Texas A&M Horticulture's site with photographs and descriptions of many trees native to East and West Texas.
- The Texas Forest Service's tree planting guide. Drawings and relevant information for urban foresters.
- Photos and descriptions of trees and herbaceous species of South Texas by the Texas AgriLife Research and Extension Center at Uvalde, TX.
- A list of print resources relevant to plant ID in Texas, with several excellent resources for East Texas trees.
- Lots of nice photos of herbaceous and tree species.
- The Harvard University herbaria's guide to pronunciation of latin taxonomic names.
- Urban forestry and other information for 200+ commonly planted trees and shrubs.
- A grant-funded database through the University of Georgia with a repository of 1000's of tree and forestry images.
- Dendrology homepage for Auburn University with photographs, species descriptions, and several photo quizzes.
- Numerous photos for each species with brief information-packed captions.
- A digital version of a handbook first published in 1925 that has since been updated 24 times.
- Fact sheets with relevant horticultural information and links for most tree species planted in the Southeast.
- Oregon State's dendro site with fact sheets, photos, and keys.
- Photos, range maps, site descriptions, photo quizzes, and several downloadable games are available here.
- University of Illinois' user-friendly database of woody plant photos and info.
- Nice PDF factsheets of Hawaiian tree species.
- A complete taxonomy, including extremely detailed descriptions, keys, drawings, photos, range maps, and links for all vascular plants in North America.
- Thousands of high resolution photographs of trees and other flowering plants. Interactive maps and other features add more content.
- Links to numerous dendrology and forestry books available for purchase.
- Links, infosheets, and downloadable PDF's of field ID guides for Virginia.
- Photographs of plants (woody and herbaceous) from the southern Great Plains region.
- Basic dendro info, factsheets, and range maps specific to Illinois.
- PDF's full of tree info and more.
- A multichotomous online key by the Ohio Public Library Information Network.
- Basic tree ID information geared towards hunters.
- Lots of basic dendro info by the Butler herbarium.
- Info and photos on several ash species by Michigan State University Extension.
- These folks sure love their maples. Focus is primarily horticultural.
- Publications by the NRCS relevant to plant ID. While primarily focused on grasses this site has great resources for longleaf pine understory species.
- An informative introductory presentation to the subject of dendrology by Pete Smith, the Texas Big Tree Registry Coordinator.
- Tree ID of common species by the South Carolina Forestry Commission.
- Information derived from herbaria collections in Northern Ontario.
- Descriptions with detailed use information for some common native arboreal and herbaceous plants in Missouri.
- Descriptions and photographs for ~100 species native to Illinois.
- Part of the Brooklyn Botanical Garden, this site contains an enormous amount of information about both woody and non-woody plants. It can, however, be a challenge to find all of the information that is available.
- Utah State University Forestry Extension provides this site with both info and photos on 48 native and introduced trees of Utah.
- Also by the Utah State University Forestry Extension, this is a slickly designed interactive database that contains information and photos for over tree 240 species found in Utah.
- A collection of high-quality photos and info for over 400 tree species, privately maintained.
- Another list of useful dendro links.
- Another list of useful dendro links.
