My experience with 'White Maman Cochet' is that it does produce pollen but it really isn't accessible unless you pick the central rosette apart and remove the comparatively few pollen sacs with tweezers. And even then you don't necessarily get a lot of pollen. So not particular available to bees or other insects. It's not impossible that WMC could be the pollen parent but in my humble opinion it's more likely something else. The seedling is very pretty though and would certainly be worth growing on because of its photochromic nature alone.