Adrian Slack being mentioned does make me wonder though, as he is well known for cultivating Cps. If he was able to do it, something might be possible? But you would have to ask him directly if it was a rumor or not. The fact that no one has been able to do it again since him (if he was able to even create a cross like that in the first place) does make it seem like it was just a rumor.
With what I know, which is like nothing haha, is that gametic incompatability(prezygotic barrier) gets in the way. The pollen from one plant cant fertilize the eggs of another plant. But I am not sure if there are crazy, one in a million chances, hence why Adrian was able to get one that eventually died, and the person who wrote that stuff in the links was able to get some seeds that look like they were swelling. If it is possible, a postzygotic barrier gets in the way, and the plants just dont do well genetically, which is why they would grow horribly and then just die... That is where the crazy lab stuff Matt mentioned would help, if it is even possible. I dont know a lot, still havent gotten to the real biology stuff in college yet, haha.
I was going to say more but I am reading a journal on the relationship of Drosera, Dionea, and Aldrovanda and its confusing the crap out of me
Aldrovanda and Drosera show a sister relationship, meaning they split from the same "node" in the evolutionary tree and are the closest related, and Dionea is the sister to that pair... This journal was published in 2002, so there are probably newer articles out there on the subject too.
It seems that if anything, Aldrovanda and Drosera would have the highest chances of producing offspring thouugh, considering they are the the ones that are closely related to eachother.
Speciation has also probably caused them to be too different, hence why they cannot cross breed... which is where my knowledge on stuff starts to end, as I did not pay enough attention in AP Bio. Dont take everything I say as fact, for that very reason, haha.
TL:DR: Doesnt seem possible, but if it was, crazy lab stuff would be how it could be achieved. Aldrovanda/Drosera would also probably be the best bet when wanting to cross breed, not drosera/dionea or aldrovanda/dionea. Also that I barely know what I am talking about, so I am probably wrong.
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