Here is a bloom of 'Starburst' that I took off to compare to 'Arena'. Arena seems to have a smaller bloom, but I have had it for years and I am guessing a smaller bulb than what I bought this spring. The markings and petal form *seem* identical, but since I am not a chemist, and did not look into chromosomes on each, I will state here that they are mighty similar. Lovely indeed.