• male and female inflorescences (catkins); Searls Park Prairie Nature Preserve, Winnebago County, Illinois
  
• Fruits (capsules) and fluffy seeds; Schulenberg Prairie Planting, Morton Arboretum, Lisle, Illinois.
  
• Fruits (capsules) and fluffy seeds; From herbarium specimen.
  
• Fruits (capsules) and fluffy seeds; From herbarium specimen.
  
• Click here for a distribution map in Illinois from the Illinois Plant Information Network
  

• plant in flower; Turner Lake Fen Nature Preserve, Lake County, Illinois
  
• Closeup of pitchers at the base of a plant
  
• a dead pitcher in longitudinal section
• several flowers
• two flowers
• closeup of flower
• flower in longitudinal section; the top part of the ovary cut in longitudinal section
• same image of longitudinal section, but the parts labeled
• ovary in cross section
• Click here for a distribution map in Illinois from the Illinois Plant Information Network
  

• Sand prairie showing habitat of plants in autumn; Quiver Prairies, Sand Ridge State Forest, Mason County, Illinois
  
• Plants in autumn; same locality as previous image
  
• Closeup showing silvery hairs on seed units, which are dispersed by wind; Weston Cemetery Prairie Nature Preserve, McLean County, Illinois
  
• Click here for a distribution map in Illinois from the Illinois Plant Information Network

• habitat , Smith Cemetery Prairie Nature Preserve, Vermillion County, Indiana
  
• habit of plant in flower, Smith Cemetery, Indiana
  
• inflorescence
  
• another inflorescence; Illinois Natural History Survey prairie restoration, Champaign, Illinois
  
• one more inflorescence; same locality
  
• closeup of flower; same locality
  
• macro of flower; same locality
  
• flower in longitudinal section; same locality
  
• "exploded" dissection of flower; same locality
  
• habit of fruits; same locality
  
• macro of fruits; same locality
  
• macro of fruits; same locality — calyx dissected away to show whole fruit, a denticidal capsule
  
• seeds; same locality
  
• image of seed taken with a scanning electron microscope; same locality
  
• seed coat as seen with a scanning electron microscope; same locality
  
• bicolored form, upper surfaces of petals red, lower surfaces white; same locality
  
• inflorescence of pink-flowered form; same locality
  
• pink-flowered form
  
• closeup of pink flowers; same locality
  
• Click here for a distribution map in Illinois from the Illinois Plant Information Netw

• habit of plant in flower; Chicago Botanic Garden, prairie restoration, Cook County, Illinois
  
• plant with flowers and leaves; same locality
  
• plant with leaves; photograph taken near sunset at Mt. Palantine Cemetery Prairie Nature Preserve, Putnam County, Illinois
  
• macro of tip of leaf showing the stiff hairs that make the leaves feel like sandpaper; Prospect Cemetery Prairie Nature Preserve, Ford County, Illinois
  
• closeup of flower head
  
• longitudinal section of flower head
  
• macro of fruiting heads, the one on the right in longitudinal section; Prospect Cemetery Prairie Nature Preserve, Ford County, Illinois — in the genus Silphium only the ray flowers around the periphery of the flower head are fertile and produce fruits.
  
• Click here for a distribution map in Illinois from the Illinois Plant Information Network
  

• habit of plant in flower; Meadowbrook Park prairie restoration, Urbana, Illinois — note that there are large leaves at the base of the plant with smaller leaves upwards along the stem
  
• top part of large, underground rootstock; dug by Don Gardner at his prairie restoration, Kempton, Illinois, April 1007 — the units on the ruler are in centemeters.
  
• deeply cut leaves at the base of the plant; Belmont Prairie Nature Preserve, DuPage County, Illinois
  
• the leaves often have a north/south orientation, hence the common name "compass plant"; Loda Cemetery Prairie Nature Preserve, Iroquois County, Illinois
  
• the large leaves are often a foot or more long; Weston Cemetery Prairie Nature Preserve, McLean County, Illinois
  
• a thick, resinous sap that can be chewed like chewing gum is often found where the stems have been wounded; railroad prairie remnant near Vayuga, Livingston County, Illinois
  
• flower heads; Weston Cemetery Prairie Nature Preserve, McLean County, Illinois
  
• closeup of flower head; cultivated in my yard, Champaign, Illinois
  
• flower head with an orange sulphur butterfly; railroad tracks, Republic, Greene County, Missouri
  
• habit of plant in fruit; Meadowbrook Park prairie restoration, Urbana, Champaign County, Illinois
  
• fruiting heads; same locality
  
• macro of immature fruiting head in longitudinal section
  
• fruiting heads; Loda Cemetery Prairie Nature Preserve, Iroquois County, Illinois — the one on the left still with disk flowers, the one on the right with the disk flowers gone to show ring of achenes ("seeds")
  
• achenes ("seeds"); same locality
  
• Click here for a distribution map in Illinois from the Illinois Plant Information Network
  

• habit of plant in flower; Meadowbrook Park prairie restoration, Urbana, Champaign County, Illinois
  
• leaves; Bennett's Terraqueous Gardens Nature Preserve, Tazewell County, Illinois — the leaves are arranged oppositely along the stem, and the bases of the two leaves are fused (perfoliate) forming a cup
  
• Click here for a distribution map in Illinois from the Illinois Plant Information Network
  

• habitat; Loda Cemetery Prairie Nature Preserve, Iroquois County, Illinois
  
• habit of plant in flower, Amanda Robertson Hapgood standing alongside; Lake Park subdivision, Champaign, Illinois — this is one of the tallest plants in the prairie, often reaching 8㪤 feet
  
• top part of large, underground rootstock; dug by Don Gardner at his prairie restoration, Kempton, Illinois, April 1007 — the units on the ruler are in centemeters.
  
• leaves are mostly restricted to the base of the plant; same locality
  
• the leaves are about the largest found in a prairie; Gavin Bog and Prairie Nature Preserve, Lake County, Illinois — on a hot day the leaves actually feel cool becaue they need to carry out a lot of transpiration to prevent overheating
  
• leaf with sun shinning through from behind; Chicago Botanic Garden, prairie restoration, Cook County, Illinois
  
• flower heads; Prospect Cemetery Prairie Nature Preserve, Ford County, Illinois
  
• flower head with an angular-winged katydid; Site "M"/Panther Creek, Cass Co., Illinois
  
• macro of flower head; cultivated in my yard, Champaign, Illinois
  
• macro of flower head in longitudinal section; same locality
  
• Click here for a distribution map in Illinois from the Illinois Plant Information Network
  

• habit of hybrid plant in flower — note that there are both basal leaves and smaller leaves on the stems
  
• leaves have the shape of prairie dock but are somewhat cut like compass plant
  
• leaves of another hybrid plant; Meadowbrook Park prairie restoration, Urbana, Champaign County, Illinois
  
• inflorescence; same locality
  
• closeup of flower head; same locality
  

• habitat of plant in prairie; Don Gardner Prairie Restoration, Ford County, Illinois
  
• habit of plant in flower; Don Gardner Prairie Restoration, Ford County, Illinois
  
• another image of a of plant in flower; Don Gardner Prairie Restoration, Ford County, Illinois
  
• flowers; Don Gardner Prairie Restoration, Ford County, Illinois
  
• closeup of flower; Don Gardner Prairie Restoration, Ford County, Illinois
  
• Click here for a distribution map in Illinois from the Illinois Plant Information Network
  

• habitat; Tomlinson Cemetery Prairie Nature Preserve, Champaign County, Illinois
  
• habit of plant in flower; same locality
  
• plant with nearly mature fruits; Savanna Army Depot/Lost Mound area, Jo Daviess County, Illinois
  
• plant with ripe red berries; North Dunes Nature Preserve, Illinois Beach State Park, Lake County, Illinois
  
• Click here for a distribution map in Illinois from the Illinois Plant Information Network
  

• habitat; Site "M"/Panther Creek, Cass Co., Illinois
  
• habit of plant in flower; same locality — the inflorescence is more or less pyramid-shaped
  
• inflorescence of many small flower heads; same locality
  
• 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
  

• habitat; Churchill Prairie Nature Preserve, Cook County, Illinois
  
• habitat; hill prairie, Site "M"/Panther Creek, Cass County, Illinois
  
• habit of plant in flower; sand prairie at Illinios Beach State Park, Lake County
  
• 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); North Dunes Nature Preserve, Lake County, Illinois
  
• Click here for a distribution map in Illinois from the Illinois Plant Information Network
  

• 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
  

• 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
  

• habitat; sand prairie at Bonnie's Prairie Nature Preserve, Iroquois County, Illinois
  
• habitat, still in flower but red fall color appearing; Revis Hill Prairie Nature Preserve, Mason County, Illinois
  
• habit of plant in flower; same locality
  
• inflorescence; Chicago Botanic Garden prairie restoration, Cook County, Illinois
  
• macro of one inflorescence branch
  
• macro of inflorescence showing flower heads
  
• habit of plant in fruit; Shoefactory Road Prairie Nature Preserve, Cook County, Illinois
  
• 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 in autumn; Meadowbrook Park prairie restoration, Urbana, Champaign County, Illinois
  
• habit in autumn; Loda Cemetery Prairie Nature Preserve, Iroquois County, Illinois — photo taken in 1978, the first year that the prairie was not mowed
  
• habit of plants; Boyd Prairie, east of Baldwin City, Douglas County, Kansas
  
• habit of plants starting to flower; railroad prairie along Route 45 south of Champaign, Illinois
  
• inflorescence in flower showing the anthers; same locality
  
• closeup of inflorescence in flower; same locality
  
• Click here for a distribution map in Illinois from the Illinois Plant Information Network
  

• habitat; Chicago Botanic Garden, prairie restoration, Cook County, Illinois
  
• inflorescences; Loda Cemetery Prairie Nature Preserve, Iroquois County, Illinois
  
• Click here for a distribution map in Illinois from the Illinois Plant Information Network
  

• plant with inflorescences and leaves; North Dunes Nature Preserve, Lake County, Illinois
  
• habit of plant in flower; Bonnie's Prairie Nature Preserve, Iroquois County, Illinois
  
• macro of inflorescence; same locality
  
• macro of fruits
  
• macro of fruits
  
• macro of fruits
  
• Click here for a distribution map in Illinois from the Illinois Plant Information Network
  

• habit of plants forming graceful mounds; Churchill Prairie Nature Preserve, Cook County, Illinois
  
• habit; Weston Cemetery Prairie Nature Preserve, McLean County, Illinois
  
• habit in autumn; Schulenberg Prairie Restoration, Morton Arboretum, DuPage County, Illinois
  
• inflorescence; plants cultivated in my yard, Champaign, Illinois
  
• closeup of inflorescence; same locality
  
• Click here for a distribution map in Illinois from the Illinois Plant Information Network
  

• nodding fruit stalk; St. Clair County, Illinois
• nodding fruit stalk; Prospect Cemetery Prairie Nature Preserve, Ford County, Illinois
• nodding fruit stalks; Thompson-Fulton Sand Prairie Nature Preserve, Whiteside County, Illinois
• nodding fruit stalks; Belmont Prairie Nature Preserve, DuPage County, Illinois
• prairie with abundant Stipa spartea in early June; same locality
• Closeup of "seeds"
• macro photo of bases of "seeds" showing sharp barb
• Click here for a distribution map in Illinois from the Illinois Plant Information Network
  

• habitat; sand prairie, Big River State Forest, Henderson County, Illinois — the bright green plant in the foreground is Stylisma
  
• habit of plant in flower; same locality
  
• flower and leaves; same locality
  
• macro of flowers from the side; same locality
  
• longitudinal section of flower; same locality
  
• macro of styles; same locality
  
• unopened fruits and also seeds; same locality
  
• embryo dissected out of seed; same locality
  
• Click here for a distribution map in Illinois from the Illinois Plant Information Network
  

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