If you click on "Plant Database", you can search for plant names close to to those.
Then you can find people who have that plant, and some will say "available to trade as seed" or "available to trade as plant".
Then you can contact them, since there are many people willing to trade who don't check this forum to see who is asking.
Also, you can add the plants that look good to you to YOUR list, and mark them as "WANT". Then anyone looking at that database entry will see that you WANT it, and they may check your HAVE lists to see what you might be trading for it.
So far, the only member I see who listed some of your WANTS as "available to trade or sell as seed" is JonnaSudenius .
search on: Black Lenten Rose, find:
Hellebore (Helleborus x hybridus 'Black Sloe')
Hellebore (Helleborus x hybridus 'Black Knight')
Lenten Rose (Helleborus x hybridus 'Mardi Gras Black Shades')
Some plants close to your names:
Columbine (Aquilegia vulgaris 'Black Barlow') (Looked deep blue to me)
Silver-Laced Primrose (Primula 'Victoriana Silver Lace Black')
Cape Primrose (Streptocarpus 'Black Panther')
Evening Primrose (Oenothera lamarckiana 'Black Magic')
If you're interested in a semi-no-name Columbine that popped up in one of my beds, probably C. vulgaris, with dark purple or dusky chocolate-purple blooms, let me know. It was probably originally from Columbine, 'Harlequin', Mixed Colors from Burpee. If so, it took several years to germinate or become big enough to notice. Let's call it 'Sine Nomine' Columbine, thoguh most people just call it "NOID".
I have a lot of those seeds. I haven't tested for viability yet since some Columbines might want stratification.to have a high germination rate.
Maybe the nodding, drooping blooms look Gothic. Or depressed.