Karen, it can be confusing sometimes when searching the database and depends on how we search. I've gotten so that I only search by genus name (Pelargonium) instead of the common name (Geranium). Of course, that's if I know the exact genus name ... when I only know the common name of a plant, I type that in and try to decipher from those listed, which one I want.
Hopefully someone more knowledgeable will come along and be able to explain better but this is the way I understand it:
Searching for Geranium Regal you will only get those with "Geranium" in the name
http://garden.org/plants/searc...
Searching for Pelargonium Regal, you will only get all those with "Regal" in their name
http://garden.org/plants/searc...
Searching for Pelargonium Elegance, you will only get those with Elegance in the name:
http://garden.org/plants/searc...
Searching for Pelargonium you will get all Pelargonium species and hybrids:
http://garden.org/plants/
Searching for Geranium, you will get all Gernaium species and hybrids:
http://garden.org/plants/searc...