That's Not What I Planted! (Help Me ID)

So I planted petunias (Johnsons Petunia Sundance Mixed) and anemones in my big planter in the hallway. Some shoots started coming up really fast, and I thought they were anemones, but then they all fell over sideways and continued to grow. I never got what I thought might be petunia plants. In fact, yesterday I sprinkled all of my leftover lobellia seeds in there as the planter is looking pretty bare. I was looking for something to trail over my railing and down into the stairwell.

Then I saw in my outside planter where I planted lobellia and anemones what I am 99% sure actually ARE anemones as I grew them last year. But these leaves on the indoor planter? No clue what they are.

Here's the mystery plant that was supposed to be petunias http://tinyurl.com/2vvnb4q

Does anyone know what these plants might be? I am stumped, and google images isn't being helpful.

I'm no expert :-( ... but is it possible that you've got yourself some parsley there?

Those leaves are about three inches across, so it would have be to be some really big parsley. :( I should have put a ruler up next to them for size comparison. It's definitely some sort of trailing plant, but I can't figure out what.

Triffids, perhaps ?

The leaves look a bit like anemona nemorosa, wild form, getting to much shadow.

quickfind:anunkasan > "The leaves look a bit like anemona nemorosa, wild form, getting to much shadow."

Klaus, I think you might be right. Just the anemone's I planted last year stood straight up and didn't droop over, the the leaves were a fraction of the size. Perhaps I ended up with a different type this year.

If you should ever plant and grow yellow summer squash, do not do what I did this past summer. Getting any Epsoms Salts (magnesium sulfate) on them will help green the leaves but it will turn the squash grass green and will have a slick skin like a cucumber.