Hi,
What a great project!
I suggest you write the folks at the New England Wildflower Society at www.newfs.org. Their current online seedlist does not show Viola sororia, but I think they can help you track down a grower or supplier of seeds near you.(And can help you with other plants on your list as well.)If they can't help with the violets, contact John Whittlesey at Canyon Creek Nursery in California. He may have some plants he can sell you.

Please let us know when and where your garden is established.

Good Luck!
Vicki