Beginner Gardening: Chrysanthemum - Garden Mums, 1 by Sneirish

Sneirish wrote:
Can someone tell me the difference between Chrysanthemum grandiflorum and Chrysanthemum moriflorium? I have one planted in my yard two years ago - "Hannah" - with a nursery tag that said grandiflorum and the Plant Files say moniflorium. Now I have another cultivar, identified at purchase only as a "Football Mum" whose flowers can get very large. I'd like to add it to the plant files, since it's not there, but don't know how to classify it. Picture below. Any words of wisdom?