Bloodroot, Sanguinaria canadensis. Flowers just starting to open
The leaf always clasps the stem and flower early on to help protect it from strong winds.
They slowly spread by rhizomes sending up a larger clump of stems and flowers each year. Last year there were only 6 flowers, this year there are 10 with a few more yet to open. You can also tell which ones have been open for a day or two and which ones are just getting started by how far up the flower bud is from the leaf.
Twinleaf, Jeffersonia diphylla. I watched this thing like a hawk waiting for the flower to open. Sadly they only flower for a maximum of 4 days and if it's not above a certain temp out (I think 68F) they don't open at all.
Better luck next year with this one. On the up side I accidentally took a picture of an ant. Looks like Tapinoma sessile.
Thankfully when I planted these I bought a flat of them and have numerous other plants scattered about the yard. It amazes me that just being planted a few feet away and they still come up and flower a week apart. Some of them are getting almost the identical amount of sun and water and still aren't going to have flowers open at the same time. Growing these things from seed must be a pain in the ass.