Very interesting theory and I had better check with my ones. I got rid of poorer bearing and ones that arent self-fertile by finding out the hard way. I found out the ecuadorian big yellow is self fertile, as is colombian red, purple princess and palmerston purple as well as frankies red set well if left alone. I did plant israeli yellow and condor on a pole with a good pollinizer just for kicks. I had better inspect the stamens and see how things line up.