Sorry but let me contradict you.

1,730 species were discovered in 2016, so what? This does not mean that those species were born in that year.
They probably already existed for thousands, if not millions, of years!

The 571 extinct species, on the other hand, will never come back.
This means that overall there has been a loss of plant species, not a gain.

If you want to bring data about the species born in that year then we can discuss it, but good luck whit that, because when you discover a new plant species it is very difficult to determine when it was born and consequently the data in this regard are very vague.