Debra,
The only way to truly know if it is Brigadoon would be to do a DNA test. Cost might be prohibitive and you have to be sure that the one you are comparing it to is the correct one.
That being said, get a piece of Brigadoon and grow it next to it and compare them when they bloom. Bill Maryott taught me to tear the petals off to be able to compare all of the beard and both sides of the petals.
But you have so many things the same, call it Brigadoon and be happy.
Congratulations. It's nice to put a name to a flower.
