Thanks for the links but it's colour forms I'm looking for.
"WOW!!! stunningly beautiful slightly nodding pale pink flowers, stained and heavily veined darker, in early spring. Native to S.W. China the plant seems to prefer a well drained humus rich soil, in light dappled shade. Plant in the lee of cold winter winds, warm sheltered site. Limited availability"
Full sun in my garden, survived weeks of being frozen solid this time last year. Shelter? None.