I was thinking there's an herbaceous weed that looks kind of like that, but I can't think of the name.
What is te expectation? Is it supposed to BE something, or was this potted up because it was interesting (or it grew unexpectedly in this pot)? It's a yogurt container right? What size is it? I can't decipher the numbers.
(is it 750 ml i.e. 3 cups?)