This is what happens to Romaine when the weather gets hot.  It bolts.  Which means that it stops growing leaves, and focuses its attention on making seeds.  

 

This is how most lettuces look when they bolt.  These are about 3 feet tall, and full of blooms.  Lettuce and dandelions are botanically related.  See the flowers?  When they open up they are all fluffy, and when they dry they are airborne, just like dandelions.

 

If we're lucky, when the seeds are ripe, it will be dry enough to harvest the seeds and save them for next spring.  But I can assure you that some seeds will plant themselves and we will have volunteer lettuce in this section of the garden.  The whole process is so exciting.

 

HAPPY  GARDENING!!!