Lettuce flowers?

So we had 3 lettuce plants and 2 of them grew up to be large, delicious heads of lettuce (kind of like butter lettuce)  but the third one stayed small and didn't develop into a nice head.*  It stayed like a little shrub. 

 Eventually it began to grow taller and a little bit pointy.  

As it grew taller we noticed that small flower buds were developing and a whole stalk like structure was under the little shrub-like leaves.  

We had long ago realized that this lettuce was not developing into  something we would want to eat.  Instead maybe we can gather its seeds and plant our own lettuce next spring using our big window as a greenhouse. 

According to wikipedia, lettuce flowers are good for seed saving beginners-- that's us!  (Learn about it here.)  We will have updates to show what a lettuce flower looks like.

 *It should be noted that this lettuce plant was kept indoors for 3-4 weeks longer than the other 2 because it seemed to be thriving inside.