Opening/Closure Status

The grounds of the USBG will be closed September 18, 2021. On other days, all outdoor gardens are currently open. The Conservatory and public restrooms remain closed, due to the closure of the U.S. Capitol campus buildings. Please monitor www.USBG.gov for updates on operating status. USBG resources can be accessed online, including educational materials, virtual tours, and online programs by visiting www.USBG.gov/AtHome.

Doll's daisy or Decurrent false aster

Doll's daisy or decurrent false aster (Boltonia decurrens)
Plant Botanical Name: 
Boltonia decurrens
Plant Threat Level: 
Endangered

Although historically widely distributed within the Illinois and Mississippi River floodplain, this species is now reduced to only 20 locations. Like many endangered plants, Boltonia decurrens is dependent upon specific environmental conditions. Believe it or not, this plant is successful with periodic disturbance from major floods. Floods open land to full sun and remove silt build-up. Today, the natural flood regime has been altered by dams and levees, and former habitat is now agricultural land. Human activities, such as regular cultivation and heavy herbicide use, are also threats to its survival.