In no particular order of bloom time:
The yellow form of Lilium concolor - first bloom
Lilium callosum and the yellow form(two seedlings, first blooms)
I wish I knew my bees. All I know is that it is a sweat bee.
Lilium canadense - first flower, a tiny bit disappointing as the seed came from the reddest flowering one I have seen. Seed wild collected in Ohio.
Lilium maculatum var. wilsonii
Lilium leichtlinii
Lilium davidii - first blooms
Edited to add photo