By Paul Pratt

Tallgrass Prairie Heritage Park, Spring Garden Prairie, and Ojibway Prairie Provincial Nature Reserve are the best locations for observing native wildflowers in September and October. Common fall flowers are indicated by an asterisk (*). Autumn foliage usually peaks in early-mid October.

ASTERACEAE

New England Aster, Symphyotrichum novae-angliae
  • Ambrosia artemisiifolia Common Ragweed
  • Ambrosia trifida Giant Ragweed
  • Symphyotrichum cordifolium Heart-leaved Aster
  • Symphyotrichum ericoides Heath Aster*
  • Symphyotrichum laeve Smooth Aster*
  • Symphyotrichum lateriflorum Calico Aster
  • Symphyotrichum novae-angliae New England Aster*
  • Symphyotrichum oolentangiense Sky-blue Aster*
  • Symphyotrichum pilosum Old Field Aster*
  • Symphyotrichum praealtum Willow-leaved Aster*
  • Symphyotrichum urophyllum Arrow-leaved Aster*
  • Symphyotrichum lanceolatum Eastern Panicled Aster
  • Symphyotrichum subulatum Annual Salt-marsh Aster
  • Doellingeria umbellata Flat-top White Aster*
  • Bidens ceruna Nodding Beggarticks
  • Bidens frondosa Devil’s Beggarticks
  • Bidens vulgata Tall Beggarticks
  • Centaurea stoebe Spotted Knapweed
  • Cirsium discolor Field Thistle*
  • Coreopsis tripteris Tall Tickseed*
  • Erechtites hieracifolius Eastern Burnweed
  • Eupatorium altissimum Tall Boneset
  • Eupatorium perfoliatum Common Boneset
  • Eutrochium maculatum Spotted Joe Pye Weed
  • Eutrochium purpureum Purple Joe Pye Weed
  • Helenium autumnale Common Sneezeweed*
  • Helianthus divaricatus Woodland Sunflower
  • Helianthus giganteus Giant Sunflower*
  • Helianthus tuberosus Jerusalem Artichoke
  • Hieracium scabrum Rough Hawkweed
  • Lactuca biennis Tall Blue Lettuce
  • Liatris aspera Rough Blazing Star
  • Linum sulcatum Grooved Yellow Flax
  • Lycopus uniflorus Northern Water-horehound
  • Prenanthes alba White Rattlesnakeroot
  • Nabalus racemosus Glaucous Rattlesnakeroot*
  • Ratibida pinnata Grey-headed Coneflower
  • Solidago altissima Tall Goldenrod*
  • Solidago bicolor White Goldenrod
  • Solidago canadensis Canada Goldenrod*
  • Solidago gigantea Giant Goldenrod
  • Solidago nemoralis Grey-stemmed Goldenrod*
  • Solidago riddellii Riddell’s Goldenrod
  • Solidago rigida Stiff Goldenrod*
  • Solidago rugosa Rough-stemmed Goldenrod*
  • Solidago sempervirens Seaside Goldenrod
  • Vernonia missourica Missouri Ironweed*
Missouri ironweed, Vernonia missurica.

Fabaceae

  • Amphicarpaea bracteata American Hog-peanut*
  • Lespedeza hirta Hairy Bush-clover
  • Lespedeza violacea Wand-like Bush-clover
  • Lespedeza virginica Slender Bush-clover

Gentianaceae

  • Gentiana andrewsii Andrew’s Bottle Gentian*
  • Gentianopsis crinita Greater Fringed Gentian*
  • Poaceae
  • Andropogon gerardii Big Bluestem
  • Cenchrus longispinus Long-spined Sandbur
  • Danthonia spicata Poverty Oatgrass
  • Elymus canadensis Canada Wildrye
  • Elymus hystrix Bottlebrush Grass
  • Panicum virgatum Old Switch Panicgrass
  • Phragmites autralis European Reed
  • Schizachyrium scoparium Little Bluestem
  • Sporobolus michauxianus Prairie Cordgrass

Hamamelidaceae

  • Hamamelis virginiana American Witch-Hazel

Orchidaceae

  • Spiranthes incurva Sphinx Ladies’-tresses
  • Spiranthes magnicamporum Great Plains Ladies’-tresses

Scrophulariaceae

  • Agalinus purpurea Purple False Foxglove*
  • Agalinus tenuifolia Slender-leaved False Foxglove*
  • d White Turtlehead