two tiny yellow clover flowering heads
As you can see from the leaves in the lower right, these are clover plants. They (and a lot of other kinds of plants, some of them even grasses) grow in our yard. The entire plants were no more than two inches/7 cm tall. I was fortunate to get as good a focus as I did, on these small flowering heads, each with twenty or so flowers.
Being members of the pea, or Fabaceae (formerly legume) family, these plants have nodules on their roots, where Nitrogen-fixing bacteria live. As a result, they should be a good protein source. We haven't tried to eat them yet.
The flowers don't last long, perhaps because of the lawnmower.
As usual, more dramatic at the larger sizes.