cactus as a tree?

[Victor Steinbok]

Even though Tim Egan qualifies it as a description objected to by some,
I am wondering if there is /anyone/ who would consider a cactus a tree.
This is not a "technically, tomato is a fruit" issue. So, technically,
"technically" is also wrong here IMO.

http://opinionator.blogs.nytimes.com/2012/03/08/the-trees-are-all-right/
> The saguaro cactus, with its droopy, anthropomorphic limbs, is the
> signature tree of the Southwest, though some say it is not technically
> a tree.

Is Egan just making this up or am I being uninformed?

     VS-)

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