In peonies, dark purple flower was assumed to be dominant over white flower color. A true-breeding dark-purple

In peonies, dark purple flower was assumed to be dominant over white flower color. A true-breeding dark-purple peony is a crossed with a true-breeding white peony to produce F1 peonies that have lavender (light purple) flowers. What kind of inheritance is the above an example of?

F1 will be entirely heterozygous individuals. Since the observed phenotype is a mix of the homozygous parents, the alleles show incomplete dominance.