Aster laevis? It used to be, but you might say it got a case of synantherism. Sound like something that would take you to the hospital? Actually, synantherology is the study of plants in the aster family. Plenty to study there! About 10% of native flora around the woprld are in the family. And with a little recent analysis, this became Symphyotrichum laeve. But we will still call it smooth aster, and mostly look for it in prairies and other open spots.