Weed/Vine ID please! Vine with set of 5 serrated leaves
I have a vine that is in my plant bed. I have posted pics to help id. I think its bindweed but the pictures do not match. The vine puts out several shoots and grows from a tuber/rhizome. I have dug down and removed fairly big chunks of the root but it seems to grow back again. For now, I'm cutting out the vine as close to the ground as possible. The worst thing is that its growing within my dwarf holly and I cannot dig it out without digging out the holly as well. The thorns are painful if you accidentally brush against it.
Any ideas on what this is and how to get rid of it?