Primulaceae (Primrose Family)
While visiting Mima Mounds yesterday, I saw these Shootingstars everywhere. I forgot which variety the signs said they were and I neglected to closely observe the leaves. So this was a good reminder of what details are important to observe in the field. But the yellow ring, as seen in the picture below, is a good way to eliminate some varieties. So I'm 99% sure this is a Henderson's Shootingstar. The yellow ring is in the wrong place for it to be a Jeffrey's Shootingstar; its growing in the wrong place to be a Poet's Shootingstar, and the petals have the wrong form for it to be a Desert or Few-Flowered Shootingstar. Will investigate its leaves next time.
Ranunculaceae (Buttercup Family)
This one could have been challenging to identify but I identified it with a botany class in the same location two years ago. So I'm sure of it. Plus, all the posted signs agree, as well. I don't find the buttercups particularly special but its good practice. I hope to create a flora one day.