Pedigree Chart of Bertrand, 1 Y-Y, Arthur J. Bliss, England, 1930

N. bicolor
Empress
N. pseudonarcissus
Madame de Graaff
N. albescens
Glory of Noordwijk
Victoria
Bertrand
N. Hispanicus
Seedling
unknown
Maximus
King Alfred
N. bicolor
Emperor
N. pseudonarcissus