There was some concern when I drafted it: https://www.inaturalist.org/flags/326555

Thanks for the comment and the requests I have received to commit the drafted change. All of the names clearly refer to the same taxon, and following POWO I have committed the change to consolidate the taxonomy used here with POWO which accepts the taxon at the specific level as Cerastium holosteoides. This is in accordance with some (e.g. Flora of Austria, Czech Flora, Flora of Germany etc.) but not all regional floras (British Flora) and I hope the change is OK for the community here.

This is an ongoing debate between POWO and some countries like Russia, Sweden, Norway, Finland and UK. And of course not only with Cerastium but also with many other genera. There are lots of sub-taxa that are commonly used in guide books, threatened species evaluations, national databases and national vascular plant research.

But, nothing new under the sun.