I am out to extend the food sources for pollinators (and flowers) in the yard. To that end, I have planned this year to be the year I go after:

Claytonia caroliniana (Carolina spring beauty)
Claytonia Virginica (Virginia spring beauty) - showier so would rather weight this species but do want both. Hope to naturalize heavily over years.

Dicentra canadensis (squirrel corn)
Dicentra cucullaria (dutchman's breeches)

Dodecatheon meadia (shooting star)

Eringenia bulbosa (harbinger of spring)

Erythronium albidum (white trout lily)
Erythronium americanum (yellow trout lily)

Hepatica nobilis (hepatica, liverleaf) - any varieties

Jeffersonia diphylla (twinleaf)

Polygala paucifolia (gaywings, fringed polygala)

Sanguinaria canadensis (bloodroot)

Thalictrum thalictroides (rue anemone) - on the fence here. Widely noted to repel wildlife but not sure if that includes bees to some extent.

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And not in the spring ephemeral group, but planned wildflower additions:

Aslepias purpurea (purple milkweed) - can't find this from local sources. May expand search.

Cassia marilandica (wild senna) - butterfly food plant


Has anyone got any experience with establishing any of the above species?

You have a very ambitious project and those are beautiful plants.
I have never grown them, but I know that they can be very difficult especially in my area.

I wish you good luck, have you been able to find any of those plants for purchase?

Yes. Some are available from local lineages from:

http://www.dropseednursery.com...

I'd like to find individual sources for the others as well as rescue plants from areas to be developed.