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Plant Profile  
FYUSE 3d Image

Common Name: Western Ragweed

Species Name: Ambrosia psilostachya

Plant Type: Forb

Family Name: Asteraceae, Sunflower Family





Plant Facts  
Origin Native
Duration Perennial
Distribution in the U.S. Across the continent except the Rocky Mountains and East-Central States
Distribution in Oklahoma Across the state



ID Characteristics

  • Field Identification Characteristics


    • Gray-green foliage with coarse texture
    • Leaves directly attached to stem; narrow with many pointed lobes
    • Similar to Sagewort but lacks the bright silvery underleaf contrast


    • Columns of small green flower heads
  • Leaf and Stem Characteristics
    • Leaf Type: Simple 
    • Leaf Arrangement: Opposite at lower nodes; alternate at upper
    • Leaf Shape: Deeply lobed
    • Stipules: Absent
  • Floral Characteristics
    • Flower Color: Greenish-yellow to yellowish-white
    • Flower Timing: July-September
    • Fruit Type: Achene



Soil Type All
Habitat Prairie, woodlands, urban areas; density increasing with disturbance
Successional Stage Mid to late


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