Azure Aster or Skyblue Aster

Symphyotrichum oolentangiense (Riddell) Nesom is native to open, dry, sandy, loamy, or rocky soils, dry to wet (seasonally drying) prairies, alvars, glades, bluffs, dunes, barrens, open deciduous woods, oak and/or pine savannahs in eastern North America (Brouillet et al. 2006; FNA).  The species was known as Aster azureus Lindley for a long time but the name Aster oolentangiensis Riddell is slightly older and has nomenclatural priority.