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Plant Profile  
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Common Name: Horseweed

Other Names: Mare's Tail, Canadian Horseweed

Species Name: Conyza canadensis

Plant Type: Broadleafs, Herbaceous

Family Name: Asteraceae, Sunflower Family





Plant Facts  
Origin Native
Duration Annual
Season Warm
Distribution in the U.S. Across the U.S.
Distribution in Oklahoma Throughout the state



ID Characteristics

  • Field Identification Characteristics
    • Flowers: White to pinkish ray florets (2-3 millimeters long), equaling or exceeding the pappus; small flower heads terminating on each branch
    • Inflorescence: Panicle of heads, terminal; involucre with 1-2 series of bracts (3-4 millimeters tall); bracts imbricate, greenish; ray florets numerous, disk florets 20-50
    • Leaves: Numerous long, narrow leaves
    • Stem can appear to have ridges; hairs on stems and leaf margins
    • Tall erect stems branched only at the top
  • Leaf and Stem Characteristics
    • Leaf Type: Simple
    • Leaf Arrangement: Alternate
    • Leaf Shape: Linear to oblancelolate (3-10 centimeters long, 2-10 centimeters wide), numerous, crowded on the stem, reduced upwards, margins entire to teeth few; surfaces coarsely hirsute to without hair; sessile to short-petioled; basal blades deciduous
    • Stems: Erect, simple, unbranched below, branching at inflorescence, surfaces coarsely hirsute
    • Stipules: Absent
  • Floral Characteristics
    • Flower Timing: June-September
    • Petal Number: 25-40
    • Fruit Type: Achenes obovate to oblanceolate (1-1.5 millimeters long), straw-colored, flattened; pappus of tan to white bristles seed



Soil Type Grows in all soil conditions; best growth on fertile, loamy soil
Habitat Throughout the great plains on rangeland, open cultivated fields, gardens, feedlots, rights-of-way, clearcuts, waste areas and recently disturbed open areas
Successional Stage Early


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