• habitat of plant in flower; Nachusa Grassland, Lee County, Illinois
  
• habit of plant just beginning to flower; Foley Sand Prairie Nature Preserve, Lee County, Illinois
  
• habit of plants at peak of flowering; Nachusa Grassland, Lee County, Illinois
  
• the rare white-flowered form; Harlem Hills Nature Preserve, Winnebago County, Illinois
  
• most of the narrow leaves are at the base of the plant; Robinson Park Hill Prairies, Peoria County, Illinois
  
• one leaf showing the 3 major veins; Prospect Cemetery Prairie Nature Preserve, Ford County, Illinois
  
• the "flowers" are actually flower heads composed of may flowers; railroad prairie remnant, Republic, Greene County, Missouri
  
• longitudinal section of flower head showing the ray and disk flowers
  
• closer view of flower head in longitudinal section
  
• habit of plants in fruits; Harlem Hills Nature Preserve, Winnebago County, Illinois
  
• fruit head in longitudinal section
  
• individual "seeds", which are actually true fruits (achenes), each of which enclose a single seed
  
• Click here for a distribution map in Illinois from the Illinois Plant Information Network

• habit of plant in flower; savanna area within 12-Mile Prairie, between Illinois Route 37 and railroad tracks near Laclede, Fayette County, Illinois
  
• habit of cultivated plant ; North Carolina Botanical Garden, Chapel Hill, North Carolina
  
• The cultivar 'Magnus', one of many cultivated varieties of purple coneflower; Chicago Botanic Garden, Cook County, Illinois
  
• fruiting head, the "spiny" parts are called chaf; units on ruler = 1 mm
  
• "seeds", which are actually achenes, the true fruits, each of which contains a single seed; units on ruler = 1 mm
  
• Click here for a distribution map in Illinois from the Illinois Plant Information Network

• flower head; hill prairie, Site "M"/Panther Creek, Cass Co., Illinois
  
• tip of plant with mature fruits; units on ruler = 1 mm
  
• spikelete in fruit; units on ruler = 1 mm
  
• dissections of spikelets in fruit; units on ruler = 1 mm
  
• Click here for a distribution map in Illinois from the Illinois Plant Information Network
  

Erigeron canadensis or Conyza canadensis or (horseweed) [Asteraceae or Compositae, Sunflower Family]

• upper part of plant showing clusters of many small flower heads; Site "M"/Panther Creek, Cass Co., Illinois
  
• Click here for a distribution map in Illinois from the Illinois Plant Information Network

• habitat; Cap au Gris Hill Prairie, Calhoun County, Illinois
  
• habit of plants in flower; Pembroke Sand Prairie, Kankakee County, Illinois
  
• flower heads; same locality
  
• Click here for a distribution map in Illinois from the Illinois Plant Information Network
  

• habitat of plant; Wolf Road Prairie Nature Preserve, Cook County, Illinois
  
• habit of plant in flower; Loda Cemetery Prairie Nature Preserve, Iroquois County, Illinois
  
• another plant in flower; prairie planting at Illini Rest Area, Interstate 57, south of Champaign, Illinois
  
• one more plant in flower; Wolf Road Prairie Nature Preserve, Cook County, Illinois
  
• leaves that resemble those of a yucca plant; Wolf Road Prairie Nature Preserve, Cook County, Illinois
  
• closer view of leaves; Loda Cemetery Prairie Nature Preserve, Iroquois County, Illinois
  
• more leaves; Don Gardner Prairie Restoration, Ford County, Illinois
  
• closer view of leaves; Don Gardner Prairie Restoration, Ford County, Illinois
  
• even closer view of leaves; Don Gardner Prairie Restoration, Ford County, Illinois
  
• flower heads; Loda Cemetery Prairie Nature Preserve, Iroquois County, Illinois
  
• macro of flower head
  
• flower head in longitudinal section
  
• macro of flowers at different stages
  
• cluster of fruit heads; Loda Cemetery Prairie Nature Preserve, Iroquois County, Illinois
  
• Closeup of 3 fruit heads; same locality
  
• individual "seeds", which are actually mericarps (fruit segments) that contain a single seed
  
• macro of mericarps
  
• Click here for a distribution map in Illinois from the Illinois Plant Information Network
  

• habit of plant in flower, note the leaves that are somewhat folded; Denby Prairie Nature Preserve, Macoupin County, Illinois
  
• plants with underground bulbs; Shermerhorn Park, Cherokee County, Kansas
  
• flower, note the petals do not reflex backward as in the woodland Erythronium albidum; Denby Prairie Nature Preserve, Macoupin County, Illinois
  
• fruit, which rests on the ground at maturity; somewhere in eastern Kansas
  
• Click here for a distribution map in Illinois based on information in — McClain, W.E., J.E. Ebinger, and A.C. Koelling. 1999. Status and distribution of Erythronium mesochoreum Knerr (Liliaceae) in Illinois. Castanea 64: 346–349.
  

• habit of plant in flower; Prospect Cemetery Prairie Nature Preserve, Ford County, Illinois
  
• flower heads; same locality
  
• macro of mature fruiting head; same locality
  
• macro of individual "seeds", which are actually small fruits, each contining a single seed; same locality
  
• Click here for a distribution map in Illinois from the Illinois Plant Information Network
  

• habitat of plant; calcareous seep south of Marsailles, La Salle County, Illinois
  
• habit of plants in flower; same locality
  
• leaves that are whorled around the nodes on the stem; same locality
  
• Click here for a distribution map in Illinois from the Illinois Plant Information Network
  

• habit of plant in flower; Bonnie's Prairie Nature Preserve, Iroquois County, Illinois
  
• perfoliate leaves that are arranged oppositely along the stem, with the bases of the pair of leaves fused together; Wadsworth Prairie Nature Preserve, Lake County, Illinois
  
• Click here for a distribution map in Illinois from the Illinois Plant Information Network
  

• habit of plant in flower
  
• Click here for a distribution map in Illinois from the Illinois Plant Information Network
  

• habitat; prairie remnant west of Lawrence, Douglas County, Kansas
  
• habit of plants in flower; ; Freeport Prairie Nature Preserve, Stephenson County, Illinois
  
• inflorescences; Gensburg-Markham Prairie Nature Preserve, Cook County, Illinois
  
• Closeup of inflorescences
  
• Macro of "flowers", which are actually flower clusters called "cyathia" (singular = "cyathium")
  
• macro of cyathium in longitudinal section
  
• plant with fall color and mature fruits; Prospect Cemetery Prairie Nature Preserve, Ford County, Illinois
  
• the individual fruits are called "schizocarps", each of which split into 3 segments or "mericarps"; Boyd Prairie, east of Baldwin City, Douglas County, Kansas
  
• 3-lobed whole fruit, one mericarp split open, and one seed
  
• seeds
  
• Click here for a distribution map in Illinois from the Illinois Plant Information Network
  

• habitat of plants naturalized in prairie; Prospect Cemetery Prairie Nature Preserve, Ford County, Illinois
  
• habit of plant in flower, the "flowers" (cyathia) are bright yellow; same locality
  
• another plant in flower; same locality
  
• Click here for a distribution map in Illinois from the Illinois Plant Information Network
  

• habit of plant in flower, this is the variety with narrow leaves, var. cuphosperma; sand prairie near Guiding Star Cemetery, Iroquois County, Illinois
  
• inflorescences and developing fruits; same locality
  
• inflorescences, this is the typical leaf type, var. dentata; ; Manito Prairie Nature Preserve, Tazewell County, Illinois
  
• Click here for a distribution map in Illinois from the Illinois Plant Information Network
  

• habit of plant in flower, the upper leaves are red; cultivated University of Illinois Annual Test Garden, Urbana
  
• Click here for a distribution map in Illinois from the Illinois Plant Information Network
  

• habitat of plant in flower; cultivated Monticello, Charlottesville, Virginia
  
• Click here for a distribution map in Illinois from the Illinois Plant Information Network
  

• habitat; calcareous seep, La Salle County, Illinois
  
• habit of plant in flower, note the paper wasp and the bumblebee; same locality
  
• Click here for a distribution map in Illinois from the Illinois Plant Information Network
  

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