please Id this weed

Good day;
I found this weed growing in my creeping thyme and am unsure of it's ID. There is some growing in a weedy section of property owned by the railway. I'm figuring a seed made it to my thyme bed. It has a long stem, and fuzzy leaves, when I touched the leaves there was a white milky substance, which I assume is probably some type of toxin to bugs. I've attached picture, sorry for the blurriness

 

Here are a couple more pictures, I was able to pluck one plant from the weedy area. I will let the one in my thyme remain for further study. The leaves are small and fussy on the back side, less fuzzier on top, and the stem has a milky white fluid. The stem is smooth.

 

Could this be a late blooming wild flower?

 

I am adding a couple more pics, this seems to be a slow growing plant, I believe it will have multiple blossoms.

 

Thread continued here....

http://www.botanicalgarden.ubc.ca/forums/showthread.php?t=52752