We can work on changing how the order of the plants is in the "Browse by genus" field, but if a species field belongs in the botanical name, then we need to keep it, otherwise the database will never be seen as complete and authoritative.
Said another way, let's not leave out critically important information just for the sake of making a list of plants sort the way we want it sorted. We can change the sorting all we want, and over-ride the species in the sort if we want to do that.
But Siberian Irises are called 'Iris sibirica' and that's the name we need to have in the DB.
Are there any other concerns about this, other than the sorting issue in the "Browse by genus" page?