You would have to look at the tag to see who the grower is. Different growers have different names for their plants.

If you don't have the tag, but remember who you bought it from, they can tell you who the grower is. You could then email that grower a picture of your flower and they can give you the name.

Looks like a sundance but you might check the American hibiscus society website. There is a wealth of information and you can see the many different varieties of hibiscus.

Chris