generally, you could start by doing an export, selecting only scientific_name (or your choice of fields) as export fields:
https://www.inaturalist.org/observations/export or https://www.inaturalist.org/observations/export?user_id=helen_y&iconic_taxa[]=Plantae)
from there, you could rearrange / reformat the results as needed.
you could also get a version of the data from the top “species” list in the Explore page (or some alternate version of it, such as https://jumear.github.io/stirfry/iNatAPIv1_observations_species_counts.html?user_id=helen_y&iconic_taxon_id=Plantae), again, reformatting as needed.)
the problem with this second approach is that it includes only “leaf taxa” down to species. so if you have a subspecies record, it will be reported at species level. and if you have, say, observations at the dicot class level and also observations of, say, a legume (which is a dicot), then “dicot” will not be included in the leaf taxon list if your list also includes the legume. you can see what i mean when you compare the 2 sets below:
-
your plant observations at the class level or above: https://www.inaturalist.org/observations?iconic_taxa=Plantae&lrank=class&place_id=any&subview=grid&user_id=helen_y&verifiable=any&view=species
-
your plant observations at the tribe level or above: https://www.inaturalist.org/observations?iconic_taxa=Plantae&lrank=tribe&place_id=any&subview=grid&user_id=helen_y&verifiable=any&view=species
