for anyone wondering what these are, see https://forum.inaturalist.org/t/several-external-tools-for-inat-data-by-kildor/19906.
the additional parameters field on this page seems to accept the same parameters as accepted by the iNat API. so you would use that syntax. in this case, plants would be either taxon_id=47126 or iconic_taxa=plantae.
here’s how it would be applied to @kildor’s Species List page:
for more information about (API) parameters, see: