Aster a Greek word for star as in the appearance of the flower head and azureus for sky blue. (syn Symphyotrichum oolentangiensis, A. oolentangiensis)
When teaching wildflowers to my high school Horticulture class. This was one of the Asters they always liked because of the sky blue flowers. In the fall most flower colors were white, yellows and golds.
Notes & Reference
#157-The Sunflower Family in the Upper Midwest (Thomas Antonio, Susanne Masi)