I planned to study gene expression, but there is nothing printed about which genes or metabolic pathways are responsible for polymorphism of the colour and size flowers for this species.
Cristine, do you still want to study flower color genetics? There is a good exampe - yellow vs. white flowers of brassica oleracea. White is dominant, but white from Portuguese kales and Chinese kales are different - their cross gives yellow floweres. Both white are linked to heat resistance of plants. Yellow - to cold tolerance.