Why are there so many names for the same kind of flower?

Flower names can be confusing. Take a Lily for example, its common name is Lily, and its botanical name is Lilium, although it can sometime be called by its variety name (i.e. Stargazer) to describe the colour. It takes years to learn, so don’t be afraid of calling flowers by a wrong name, most florists should know what it is your asking for.