Reaching out to the sun

For some weird reason, I labelled this "Yellow Lettuce" when I sent it around via e-mail. I remember seeing these very small, yellow flowers growing at Jim Coutts' amazing homestead, just north east of Nanton (south of Calgary) and immediately thought they were Yellow Lettuce. However, the flowers are not like this - this looks more like an Annual Sowthistle flower to me, even though it was very small. Anyone happen to know?

Here comes the sun, FINALLY, after an overcast, cold, wet "summer - yay!!!!!! Enjoy it, everyone. I have a volunteer shift to go to, so will be indoors : (