Would the word and be omitted before the last item in either of these two sentences?

Maximum tree-ring counts for species sampled are as follows: American beech (50), tuliptree (125), white ash (221), sugar maple (80), red maple (~240), chestnut oak (180), sweet birch (250), and eastern hemlock (314)

More steep slopes north and south of this grove included trees with the following maximum ages: tuliptree (145), chestnut oak (~314), American beech (155), and sweet birch (199)

  • Unrelated to your question, but I don't like the use of parentheses here - the things referred to before the colon are the ring counts and ages, so I would argue for either "50 (American beech), 125 (tuliptree),..." or "American beech, 50; tuliptree, 125;..." – DM_with_secrets Jan 28 at 22:37
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    @DM_with_secrets That's a good point, thanks for the insight. – Jack Jan 29 at 2:08
  • @Nai45 Could you please tell me why you believe this question to be off-topic? – Jack Jan 29 at 2:09
  • @Jack Here on Writing SE, we try not to deal with very specific grammar questions, that's English Language and Usage SE's job: english.stackexchange.com – Nai45 Jan 29 at 2:11
  • @Nai45 Okay, thanks for the information. Should I re-post this question at english.stackexchange.com then? – Jack Jan 29 at 2:20

I believe that this is a matter of style. Some presctiptivist grammar texts used to insist that the "and" (or other con junction) before the final list item was required. That view is, I think, now out of date. However, it is my view that such sentences tend to flow better and are clearer with the "and" included.

  • @Nai45 No, i meant "now", Thanks for drawing my attention to the error. I have fixed the answer.. – David Siegel Feb 5 at 22:27

Since you have used a colon in the first sentence, you can use a semi-colon after each number instead of a comma, and it would then be acceptable to drop the 'and' at the end of your sentence.

  • Hi! Welcome to Writing SE! Thank you for the answer. You can improve your answer by providing a citation to verify your statements. – Nai45 Feb 5 at 17:38

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