My Hybrid Plants
As near as I can tell - the Rudbeckias, Calendula, Cerise Queen Yarrow and Coreopsis (except Presto that's really new) I'm offering are seed stable although at some point in the past they were hybrid plants.
My hybrids that are probably not seed stable:
Snapdragon Antirrhinum majus Floral Showers™ White F1
Carpet Snow (Dianthus) F1
Dianthus chinensis Diana F1
Crossing
I separate my Columbine into different areas, so if I offer a color you *should* get it. As a whole, Columbines seem to want to revert to purples (and I don't grow any of those, thus far none of my seed have yielded that color). Haven't collected seed (it's dang tiny) but I have only ever purchased Terracotta Calibrachoa yet all I now have in my garden is Hot Pink (it must be one of the RR rr Rr genes talked about in the first article). My Snapdragons and Knautia/Scabiosa are also grown in color separated areas, so again, you'll likely get the color I'm specifying (and other trades plus my own growing show this to be true).
I generally don't offer squash seed as they're the rabbits of the vegetable area, crossing readily. I did once grow something (water is precious here, plus space and time) that was a watery crossed mess so I don't take the chance. However, Fedco seed gives very generous commercial portions (unlike Parks, Pinetree and Stokes who generally go with 10 seed per packet and I get 2 years planting from those packets), so I may have commercial seed for some of these.
Some people call tomatoes and peppers self pollinating - it just means they have male & female parts within the one flower but a pollen covered bee can cause your peppers and tomatoes to cross. This happens much much less than with something like squash. Any tomato or pepper seed I offer could possibly have crossed. I don't bag seedheads or have plants widely separated. This is my favorite easy to understand quicksheet that uses peppers as example.
http://asi.ucdavis.edu/program...
From that sheet - Open Pollinated in the industry means controlled pollination with out-crossing prevented - not plants simply left out to nature. "Many traditional pepper varieties are open- pollinated. This term is commonly used for what is really controlled pollination, where plants have been in-bred for several generations and have a stable genetic make-up, and out-crossing from different varieties is prevented". So, though my Rudbeckias are from seed sold as open pollinated, not all the varieties I grow are separated by 400 feet. You would most likely get say Autumn Colors or Indian Summer as there is some distance between them - but it is possible you could get a cross.
If needed, I'll come back and edit this as I add to my seedlist.