The tulip tree that you and I are discussing is [url=https://en.wikipedia.org/wiki/Liriodendron_tulipifera]Liriodendron tulipifera
[/url]. It is a member of the magnolia family. However, many people also call [url=https://en.wikipedia.org/wiki/Magnolia_liliiflora]Magnolia liliiflora
[/url] by the name "tulip tree", which can be very confusing. That's why, if I must use a common name for it, I prefer to call Liriodendron tulipifera
the "tulip poplar", even though it is not related to poplars in any way.
Even better, just use the scientific names for plants. That way, there will be no confusion.
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