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AFAIK, Solaris doesn't share any code with the 'UNIX' this talks about, or at least historically didn't (dtrace and ZFS got ported to at least some BSDs; some other code may have moved later). At the very least, adding Solaris would make this a forest, not a tree.

EDIT: just read sibling comment. From there, read http://en.wikipedia.org/wiki/Solaris_%28operating_system%29 for verification. Solaris was based on http://en.wikipedia.org/wiki/System_V_Release_4#SVR4. You never are too old to learn.

Solaris was mostly based on SysV, but SunOS, Solaris' predecessor, was based on BSD, and should be included, I think.

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