The US Tree Assessment was published in Plants. People. Planet. in August 2022. This was a large collaboration led by the Morton Arboretum, the U.S. Botanic Garden, NatureServe, Botanical Gardens Conservation International, the U.S. Forest Service, and others. In this paper, we provide a checklist of Trees of the USA under a standard definition, map their distribution, and conducted conservation status assessments for each.
https://nph.onlinelibrary.wiley.com/doi/10.1002/ppp3.10305

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