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I have not seen the original publication of N.x alleniae or heard of the locus classicus but it is most likely that hybrids between N. viridiflorus and both N. serotinus and N. miniatus do exist. As far as I lnow both N. viridiflorus and N. serotinus grow together in Morocco and I'm sure they do hybridise.
First as usual for me is Cedric Morris
This group of N. papyraceus and subsp. (now species) are not very clar for me... This is Narcissus papyraceus subsp. polyanthos