Thanks to Leslie who identified the 'weed' I found in the lawn here 2 weeks ago, but more importantly, gave me a link to help identify more 'weeds' and wildflowers, I was able to quickly identify the subject of my post today. I've seen this one growing in many lawns, including ours, and did a little research into it. It's identified by its scientific name of Richardia Grandiflora but is commonly called Largeflower Mexican Clover, Largeflower Pusley, and Fairy Cups. It originated in Brazil.
Various sources identify it as an invasive weed, while others call it a wildflower. No matter what you decide to call it, it looks pretty nice, and the bugs on this one like it too.
(60mm f14 1/8 sec ISO200)
click on photo to enlarge