@candyquilt-- I'm not sure if the name is interchangeable in all cases. For example, the flower "angel's tears" also belongs to the Narcissus genus. It's a species of Narcissus called Narcissus triandrus. Now we can't call angel's tears "daffodil" because it will become confusing.
It's probably best to refer to them with their common name or their exact Latin name to avoid confusion. People may confuse the different names of plants, but it's difficult to confuse the Latin species names.