That second photo looks like a Zebra Mallow (Malva sylvestris). They are related to Hollyhocks, hibiscus, Rose-of-sharon shrubs, and other mallows. You can see the little seeds over on the left. On the Common Mallow (M. neglecta), they look even more like little wheels of cheese, so that weed is also called Cheeseweed. I've never eaten the flowers of the Zebra mallow, but I eat Hollyhocks, Rose-of-sharon, and hibiscus flowers, and I eat the wild mallow leaves and young seeds. They are worth getting to know!