Lee Ann, the Shirley Poppy is a common name, with a few cultivars now added but don't think Shirley Poppy an official cultivar name itself so that should probably be removed.

Canna x generalis 'Phasion' syn. 'Tropicanna' may be in the same category. Canna Tropicanna®
As I understand it 'Phaison' is the accepted cv. name now, by RHS and EU in general. Here in the states we all see it as 'Tropicanna'. I don't know how to properly identify the Tropicanna as I've been told to keep cvs. out of the synonym field, hence the common names.

You're right Evan. Phasion is a cultivar group that includes at least 7 different cultivars. Tropicanna is a trademarked (in the U.S.) name for Phasion.

I'm not sure how to handle this case.

Oh the plant kingdom can be a confusing creature!

YES! NOT SLEEP DEPRIVED.

I discovered that the "Shirley" poppies are a cultivar group...no idea what that means...maybe because they're so varied in their colours?

Either way, I really believe they should have their own listing.

Cultivar group, another concept to research. Is that what references to Italian Group Canna cultivars means?
I did find out that Tropicanna is no longer an accepted cv. name in the EU and South Africa as a result of court decisions.

Yes, they are a cultivar group, in this case it means that from the original Shirley Poppy, (common name) some hybrids have been discovered or hybridized and named. So yes, for the un-named Shirley Poppies, they should have their own entry but 'Shirley Poppy' isn't technically a cultivar name by itself because of the wide varieties in colors.
If you look at the bottom of the list for the poppies, you'll see where the Shirley Poppy Papaver rhoeas named ones start with 'American Legion'. http://garden.org/plants/brows...
If you do some research on the cultivar names, you could probably find out which cultivar class they belong to, with the Shirley Poppy Papaver rhoeas or the Flanders Field Poppy.The common name Flanders Field Poppy and Shirley Poppy seem to be mistakenly grouped together everywhere, including the database here.

One distinction noted here from that link posted by Myriam, bonitin.
According to the original grower of the Shirley Poppy, "When later writing on the subject, he set out what might be said to be the specification for his Poppy.
He said...
"Let it be noticed that true Shirley Poppies...
(1) are single, (2) always have a white base with (3) yellow or white stamens, anthers and pollen, (4) never have the smallest particle of black about them.
Double Poppies and Poppies with black centres may be greatly admired by some, but they are not Shirley Poppies."

So it already looks like some images may have to be edited out.

A few questions about plant names and how the database works.

I'll use Canna 'Tropicanna', ... and Iris as examples:

My research indicates Canna x generalis 'Phasion' is the currently accepted cv. name. In the USA it's most commonly available as 'Tropicanna'. In the UK it's sometimes referred to as 'Durban'. I've seen other references to misnamed plants. At a minimum all three of these cv. names are important for members to both find the plant in question, and get the correct information.

If I understand the Cultivar Groups concept correctly, it is somewhat comparable to classifications of Iris. TB, Aril bred, Siberian, etc. It seems there are many Families or Genus of plants for which this is important information. While some plants currently have the DB configured to accommodate this, it's not part of the "typical" DB proposal structure.

What are your thoughts about adding two fields, one for other names and one for Cultivar Groups (or comparable)?

Would the Synonym field work for that? I know I have been using it for some of the sempervivum. When a search is done for either name it will bring the plant up in the search.

Lynn, you're thinking on the right track, but synonyms are for botanical name synonyms (genus and species only).

The more I think about this, I am thinking that the best solution is going to be to add an extra field for "Other cultivar names". Then you would enter any additional cultivars into that field, and program it to work just like the extra common names and extra synonyms, where you can add multiple cultivar names, each in their own field, through the "Edit plant name" area.

That sounds great Dave. I can think of one in the Sedum database that it would apply to. Sedum 'Autumn Joy', or Sedum 'Herbstfreude'

The rose database itself would be be a big project to transfer over those multiple names but it sure would be a huge asset to have that extra field!

Anybody else want to weigh in on this? Or should we proceed with the plan?

I would be interested in doing it. Seems it would make sure a person looking for a particular plant would for sure find it under any of it's known names. : )
But most of the time I don't see the Big Picture.

Will this be without a thumbs up like synonyms?

Right indeed.

pun intended.

I think lilium would definitely benefit from it.