Identification: Can you identify this plant?

This plant came up in the corner of my garden this spring and is very tall (about 8ft) and is quite spectacular. I think it may have been in a package of mixed wildflower seeds that I sprinkled in that corner last year but they didn't come up last year.
The main stem and branching stems are so heavy that a few have broken off, and I had to tie the main stem to the fence so it wouldn't fall over. The flowers are quite lacy and delicate looking, although I picked on and put it in a bowl and it is still fresh looking after 4 days. I would love to know the name of this plant.
Thanks, Diana
Salt Spring Island, BC

 

A hollyhock maybe? (Alcea rosea)

 

It may be hollyhock, although I haven't seen pictures of any that have as many stem with flowers coming off the main stem.
Thanks

 

Hmmm, cant get the thumbnail to open up for some reason, but it made me think of ShoeFly plant!