Adding new taxon to iNat
Flag it on the taxon page (in this case Watsonia - find Watsonia: https://www.inaturalist.org/taxa/72425-Watsonia
Check on the taxon tab that the species is not there, by searching the taxa (top menu : other :: Taxa info) Check that it has not been sunk by selecting active and inactive taxa:
https://www.inaturalist.org/taxa/search?is_active=any&q=Watsonia+vicscutteri&utf8=%E2%9C%93
If it is not, all that is required is on the Taxon Page, click Curation, and then Flag it, giving the POWO link - e,g, https://www.inaturalist.org/flags/635062
No need to provide literature if it is already on POWO: if it is not in POWO you need to provide the paper (or alternatively wait a few months for it to go onto POWO).