I just got a note back from Edelweiss - they are amazingly responsive - seems like a great place!
The owner(?) says:
"Thanks for letting us know. It’s funny, I just noticed a week ago when I was dividing the plants that there were tags with Draba a. and Arabis a. and I made a note to verify which one it actually is. And, yes, Arabis makes more sense."
So, it does it appear to be a case of mixing up tags!
