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The tree was last verified in the wild in 1803 by the English plant collector John Lyon (although there are hints it may have been present into at least the 1840s).<ref>Bozeman, John R. and George A. Rogers. 1986. “‘This very curious tree’: Despite years of searching and research the enigma of ''Franklinia alatamaha'' endures,”'' Tipularia'', (November), p. 9-15.</ref> The cause of its extinction in the wild is not known, but has been attributed to a number of causes including fire, flood, overcollection by plant collectors, and [[fungus|fungal]] [[disease]] introduced with the cultivation of [[cotton]] plants.<ref>Dirr, Michael A. 1998. Manual of Woody Landscape Plants: Their Identification, Ornamental Characteristics, Culture, Propagation and Uses. Stipes Publishing L.L.C.: Champaign, IL.</ref>
All the Franklin trees known to exist today are descended from seed collected by William Bartram and propagated at [[Bartram's Garden]] in Philadelphia. It has now been cultivated in over 1000 sites worldwide including botanical gardens, private homes, parks, and cemeteries.<ref>Bartram's Garden (Philadelphia, Pa., USA), "The Franklinia Story," http://www.bartramsgarden.org/franklinia/index.html {{Webarchive|url=https://web.archive.org/web/20070821050936/http://www.bartramsgarden.org/franklinia/index.html |date=2007-08-21 }}, accessed 1 July 2007.</ref><ref name=":0">{{Cite web|last=Meier|first=Allison C.|date=2018-04-27|title=America's Mysterious Lost Tree|url=https://daily.jstor.org/americas-mysterious-lost-tree/|access-date=2020-08-07|website=JSTOR Daily|language=en-US}}</ref> It is suggested that more than one tree was sampled by Bartram during his original collection in Georgia and the diversity was maintained over the years.<ref>{{Cite journal |last1=Gladfelter |first1=Heather J. |last2=Yadav |first2=Lav K. |last3=Merkle |first3=Scott A. |last4=Wilde |first4=H. Dayton |date=2020-07-30 |title=Genetic diversity and population structure analysis of Franklinia alatamaha, a tree species existing only in cultivation
==Status as a glacial relict==
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