My garden continually surprises me. I was given this pot of begonias earlier this year by a friend who moved. They duly flowered in spring and then I just admired their leaves. This week, I noticed these purple flowers start to open and realised they were attached to a totally different plant in the same pot. I should have realised this earlier - Stephanie loves to plant more than one type of plant in a pot - but it took me unawares. My question is: what is the name of the plant? Can anyone help me with identification?