hello Mark
I have grown both male and female forms of E. chrys. but they had all some yellow shade in them,but the very pale ones look like white on a picture as the petals are very shiny specially in the sun.The pink ones were always hybrids even if the label said it was E.chrys.I got some very nice hy brids myself,it was with E. absinthoides if I remember well (it was many years ago)
Is there somebody who grows the blue form of E.absinthoides?I lost mine when moving house.