Why are macrons not used consistently?
Long vowels in Māori words are marked with a macron (a line over the vowel). This is an aid to correct pronunciation.
In book titles, and when information is quoted directly, we do not use macrons unless they were used in the original text.
Why does Previous names include scientific names that are not valid synonyms?
The Previous names field contains those names that have been used in the literature to refer to the plant or other organism. It is by no means complete. It contains old names that we've come across during information searches to refer to this organism. However these names may not be recognised as valid synonyms by taxonomists, particularly if they had been used incorrectly in the literature.