Premise: Chrysanthemum boreale (or "Dendranthema boreale") is a flowering plant within the Asteraceae family and "Chrysanthemum" genus. It used to be in the compositae family and many books still contain as such. It is a perennial flowering plant that is often noted because of its yellow flowers. It has 18 chromosomes at the diploid stage.
Hypothesis: It is extremely unlikely the number of chromosomes changes from one individual to the next