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| Watersheds Native Plant Database || Canada / Ontario || Grasses, Ferns, Shrubs, Trees, Vines  || https://watersheds.ca/plant-database/

| Watersheds Native Plant Database || Canada / Ontario || Grasses, Ferns, Shrubs, Trees, Vines  || https://watersheds.ca/plant-database/

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| Columbia University, University of Maryland, Smithsonian Institute* || North eastern USA and Canada || Native and non-native trees and shrubs || http://leafsnap.com/species/

| Columbia University, University of Maryland, Smithsonian Institute¹ || North eastern USA and Canada || Native and non-native trees and shrubs || http://leafsnap.com/species/

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| Online Plant Guide || USA || Grasses, Ferns, Herbaceous, Shrubs, Trees, Vines, Ornamental || http://onlineplantguide.com/Index.aspx

| Online Plant Guide || USA || Grasses, Ferns, Herbaceous, Shrubs, Trees, Vines, Ornamental || http://onlineplantguide.com/Index.aspx

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* Leafsnap is an on-line field guide, available as a free mobile app that uses visual recognition software to help identify tree species from photos of their leaves, flowers and fruits <ref>http://leafsnap.com/species/</ref>

1. Leafsnap is an on-line field guide, available as a free mobile app that uses visual recognition software to help identify tree species from photos of their leaves, flowers and fruits <ref>http://leafsnap.com/species/</ref>

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