Flat-topped white aster, umbellate aster

The stem of this aster grows 30 to 250 cm tall and branches out near the top. The lance-shaped, fairly broad leaves are 10 to 15 cm long. The flowers are clustered in flower heads 12 to 20 mm in diameter. There are many of these white-rayed inflorescences. The fruit is surrounded by 2 rows of silky tufts.