A little ways down in this article -
http://garden.org/ideas/view/f...
says this -
'Chrysanthemum x rubellum 'Hillside Sheffield Pink,' AKA ‘Sheffield Pink’, ‘Single Apricot’, ‘Single Apricot Korean’ or ‘Sheffield’. Starts out in early fall with medium pink buds, turning to pale apricot in October.'
I think the Korean part is an attempt to classify it as a chrysanthemum type of bloom, like chrysanthemums with single, daisy-form flowers.