Got this from a well known UK Rare Bulb nursery as Narcissus pachybolbus, and the original bulb was huge. Some 10 years later smaller offsets are flowering, but how do you tell it from N. papyraceus/N. panizzianus?
Well, the very useful key in the Daffodil, Snowdrop and Tulip Yearbook 2014 ("A translation of the key to species and subspecies of
Narcissus in
Flora Iberica") keys this out as
N. papyraceus, not
N. pachybolbos. Too late to ask for my money back!