 Upland White Aster
Upland White AsterOligoneuron album
Other names:
prairie goldenrod
From the Connecticut Botanical Society
Prairie flat-top-goldenrod is 12-18 in. tall with flat-topped flower heads   bearing white ray petals and yellow disk centers. The basal, as well as stem   foliage, is shiny dark-green, narrow and willow-like. 
      
      • Family:   Aster (Asteraceae) 
      • Habitat: dry open areas, usually in limy soil
      •   Height: 1-2 feet
      • Flower size: flowerheads 3/4 inch across
      • Flower   color: white
      • Flowering time: June to September
      • Origin: native