W.F. Leenen
Warmond, Holland; Sassenheim
W.F. LeenenPerianth segments yellowish white; corona vivid yellow.
A description according to the 1976 issue of Parks catalog: “The cream perianth is 5 inches across. Cup is 2 1/2 inches primrose yellow. Heavy, stiff stem, 20 inches long, carry the upfacing flower.”
There are no photos of "Amsterdam" in Daffseek.