I'm going to politely disagree with you on that one, but I don't claim to be a grammar guru. I believe a comma would always be called for after the word "green" in the original example (and isn't part of the never-ending serial comma debate). Or maybe we're saying the same thing.
Actually, I'm so old-fashioned I still refer to it half the time as the "Oxford comma".
Perhaps I was unclear. Not unusual.
I think we are not in disagreement. Not really.
I have not heard the term "Oxford comma," but I am guessing it is another term for the serial comma. (A quick Googling verifies that. For example,
http://www.askoxford.com/asktheexperts/faq/aboutother/oxfordcomma.) It is an odd term to me, though, as the Brits seem to omit the serial comma. That must be why Oxford's use of it stands out and it earned the name "Oxford comma."
I am pretty sure that I was taught in elementary school to omit the comma before "and" and "or" (that is, not to use the serial comma). Decades of reading, writing, and editing have demonstrated that the instruction was wrong unless one is obligated to follow Associated Press style.
Yes, that particular example is confusing because of the "etc.," which requires it anyway. See my comment on the
Chicago Manual section Section 6.22.
As I said, "the full explanation [of the serial comma and the reasoning behind it] calls for examples and discussion way beyond what I want to go into here."
--Ken
P.S. Many folks might not realize that
etc. is an abbreviation for the Latin phrase
et cetera, meaning "and others." (It always irks me to see the abbreviation mis-written as "ect." -- a sign of impaired education.) In any event, that is why "red, blue, green, etc.," or in other words, "red, blue, green, et cetera," is equivalent to "red, blue, green, and others." That is why I said it is a distinction without a difference. "Etc." stands in for "and" plus the last item in the list ("others"). However, the
Chicago Manual would have a comma if only one item preceded "etc." (For example, "That model comes in red, etc.") The comma indicates the (very brief) pause that would normally be in the spoken phrase. My own advice to writers is to avoid "etc." in formal writing (and, for that matter, to avoid other Latin abbreviations, which are often misused and misunderstood anyway). I wrote a style guide for the California Research Bureau (available via a link on my website), and wrote and edited reports for CRB for many years, so I am not completely without pertinent experience here. Most folks never really have to think about these kinds of details. I did.