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America conifer society によると以下の通り
イチョウは論理的に針葉樹だそうです♪
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The History of Ginkgo
Ginkgo are not strictly conifers, and, at this writing, have been classified into their own division, Ginkgophyta, with a single class, order, family, genus and species, of which Ginkgo biloba is the only extant representative. The Ginkgo fossil record dates back some 200 million years. Native to China, they are believed to be extinct in the wild, as today’s populations now appear to have been cultivated. Ginkgo are, however, gymnosperms, and so are more logically lumped with conifers than not, and the American Conifer Society includes them under its umbrella.
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