When is a tree (large, woody plant) not a tree (connected acyclic graph)?

This has something or other to do with the topic of the previous post.
(The tree (?) is a crepe myrtle near the campus of North Carolina State University in Raleigh.)
When is a tree (large, woody plant) not a tree (connected acyclic graph)?
This has something or other to do with the topic of the previous post.
(The tree (?) is a crepe myrtle near the campus of North Carolina State University in Raleigh.)