• habit of plant in flower; sand prairie, North Dunes Nature Preserve, Illinois Beach State Park, Lake County
  
• another plant in flower; same locality
  
• flat-topped inflorescence (corymb); same locality
  
• Click here for a distribution map in Illinois from the Illinois Plant Information Network
  

• habitat; calcareous swale at North Dunes Nature Preserve, Illinois Beach State Park, Lake County
  
• habit of plant in flower; calcareous fen, Mud Lake, Chain-O-Lakes State Park, Lake County, Illinois
  
• another plant in flower; North Dunes Nature Preserve, Lake County Illinois — note the large leaves at the base of the plant
  
• flat-topped inflorescence (corymb); same locality
  
• Click here for a distribution map in Illinois from the Illinois Plant Information Network
  

• habit of plant in flower; sedge meadow, south of Marseilles, La Salle County, Illinois
  
• Click here for a distribution map in Illinois from the Illinois Plant Information Network
  

• habitat; Wadsworth Prairie Nature Preserve, Lake County, Illinois
  
• habit of plant in flower; hill prairie, Site "M"/Panther Creek, Cass County, Illinois
  
• flat-topped inflorescence (corymb); Paintbrush Prairie Nature Preserve, Cook County, Illinois
  
• another inflorescence with a painted lady butterfly; Loda Cemetery Prairie Nature Preserve, Iroquois County, Illinois
  
• habit of plant in fruit; Temperance Hill Cemetery Prairie Nature Preserve, Lee County, Illinois
  
• Click here for a distribution map in Illinois from the Illinois Plant Information Network
  

• habit of plant in flower; Savanna Army Depot / Lost Mound area, Jo Daviess County, Illinois
  
• Click here for a distribution map in Illinois from the Illinois Plant Information Network
  

• habit of plant in flower ; top of sandstone bluffs along Illinois River, South Ottawa, LaSalle County, Illinois
  
• flowers; same locality
  
• longitudinal section of flower; Braidwood Dunes and Savanna Nature Preserve, Will County, Illinois
  
• plant with fruits; Quiver Prairies, Sand Ridge State Park, Mason County, Illinois
  
• photo of one tiny spine (glochid) taken with scanning electron microscope
  
• Click here for a distribution map in Illinois from the Illinois Plant Information Network
  

• habit of plant in flower; hill prairie, Chautauqua, Jersey County, Illinois
  
• Click here for a distribution map in Illinois from the Illinois Plant Information Network
  

• habitat; Revis Hill Prairie Nature Preserve, Mason County, Illinois
  
• habit of plant in flower; Quiver Prairies, Sand Ridge State Park, Mason County, Illinois
  
• another plant in flower; cultivated in my yard, Champaign, Illinois
  
• one more habit image; same locality
  
• macro of flowers in longitudinal section
  
• plant with developing fruits; Hanover Bluff Nature Preserve, JoDaviess County, Illinois
  
• Click here for a distribution map in Illinois from the Illinois Plant Information Network
  

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