Thanks for all of the links, Lynn, but they're not links to taxonomic sites. The information in our database is taken from taxonomic databases, and we therefore have entries for all three names. As long as the COL lists them as accepted names (or provisionally accepted names) rather than synonyms, we'll keep all three entries open. Similarities in appearance and habit are important characteristics, but they aren't the deciding factor. At some point, DNA tests will be performed to learn whether these three plants are the same. If they are, two of the names will be reclassified as synonyms. Until that has been done and the information in the Catalogue of Life has been changed, we'll continue to have three entries for the three plants.
