E.pinnatum colchicum x E.grandiflorum.
Raised by A.Donckelaar in Ghent, and named in 1849. More yellow in the sepals than the later named 'Neosulphureum', it has up to nine leaflets on the flower stalk, and the spur on the petals is as long, or even longer than the sepal above it. All of these forms are excellent compact clump forming plants which flower freely.
Just to keep the pot of chaos boiling, I also have this plant which I have grown for a couple of decades. It came originally from Macpennys in Bransgore
and has less grey colour in the spur tips.