I have a little experience with one unknown pollen-less cultivar that is at least 45 years old. I'm 55 years old now, and have been growing it since my childhood. I call it "Lilium from Harvey". Harvey Pellerin was a Cajun friend of my parents, and he gave me my very first lilies to grow. Every once in a while, a flower of this cultivar does throw a single pollen grain or two, and if they are fertile I have no idea. Maybe the anthers just never open, but I think not. I'm embarrassed to say that I have never really investigated (where is that "smack on the head" emoticon?). Anyway, this is it:
And these are some representative examples of seedlings from it.
Lilium from Harvey x Lilium 'Kathy Jan'
Lilium from Harvey x Lilium 'Olina'
Lilium from Harvey x Lilium 'Olina' (different pod)
Lilium from Harvey x Lilium 'Olina' (yet another different pod)
Lilium from Harvey x Lilium 'Winnipeggy'
So crossing with Kathy Jan always produced pollen producing offspring.
Crossing with Olina always produced pollen-less offspring.
And crossing with Winnepeggy, well, I don't remember if all the offspring were pollen-less or not. That's the only pic I have.
(But isn't it interesting that a yellow crossed with a red (Winnipeggy) produced a white?)
When the debate is lost, slander becomes the tool of the losers. - Socrates