Advents Corner

My Mom and I spent the day together yesterday.  She is down from Louisiana so I took the day off of work so we could run around.  We ended up at the farmer’s market to get some apples and oranges to take back with her.  We bought 3 potted plants and the sign that was next to the plants said dragon wings.  They are so pretty and purple.  When I did a search on the flower the images that I found did not look like the flowers we bought.  Could someone out there tell me if there are several different types of “dragon wings” or maybe if you have heard it called something else?  Any info would be helpful.