Beginner Gardening: What happened to my camellia?, 0 by blumz

blumz wrote:
A couple of years ago I purchased a camellia shrub at a large botanical garden sale. The shrub bloomed for me the follow fall, and again this past fall. This spring it started to grow, only problem is, it's growing into something other than a camellia! About half the shrub still has camellia foliage, and the other half is something I don't recognize. Apparently, the camellia was started on the root stock of another shrub, and the host plant has somehow managed to come back. I don't know why ... :o( And I don't know what to do about it ... :o(
Questions: What is the mystery shrub? What can I do to get it out of my camellia?

Here's a picture of the part of the shrub that I can't identify.