Lion's tooth

Possibly not the best use of my time 'off' work, but I have always wanted to take decent pictures of flowers (ah, the secret ambitions of Ordinary People:)
This flower is one that blooms exuberantly through our yard. It seems to be some sort of dandelion, but the leaves are bigger, there are multiple flowers per stem, and the stems are several feet tall. They are quite showy - in the morning. Afternoons, the flowers close up for a 'siesta' and then re-open the next morning. They do this for about a week and then turn white and fluffy to disperse seeds just like their more modest cousins, the common dandelion (I feel very sure they are related. Any botanists reading this?) I picked a few and put them in a mug in the kitchen, and, fascinatingly, they do the open-and-close thing on the same schedule as their still-growing outside brothers.