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Cyril, that looks like a hybrid you have raised, we have many similar all are nice plants some exceptional.Erythronium klamathense has plain green leaves, a white flower with yellow centre - I showed it in last weeks bulb log .http://www.srgc.org.uk/logs/logdir/2014Apr161397643442BULB_LOG_1614.pdf
The Hybrid Mark Turner shows here http://www.pnwflowers.com/photos/may/040512PilotRock/0405897 is a real beauty.