My recommendation for natives would be Prairie Moon Nursery. Search for "woodland" and your soil moisture and other preferences. I've only ordered full sun plants but they do have quite a few plants for shade or partial shade--their categories are prairie, savannah, and woodland. Both seeds and plants are available. I've been very happy with their plants.

Here is a link that might be useful: Prairie Moon Nursery

: ) Thank you. I'll check them out.