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Common Name: Sumpweed

Other Names: Annual Marsh-elder, Rough Marsh-elder

Species Name: Iva annua

Plant Type: Forb

Family Name: Asteraceae, Sunflower Family





Plant Facts  
Origin Native
Duration Annual, perennial or biennial
Distribution in the U.S. Eastern US to Nebraska, Kansas and New Mexico
Distribution in Oklahoma Body of the state



ID Characteristics

  • Field Identification Characteristics


    • Rough texture on stems and leaves
    • Stems branching from thick shaggy root
    • Opposite, alternate leaves; broad to narrow teardrop shape; serrated


    • Columns of green unnoticeable flowers rise from where leaves attach to stem
  • Leaf and Stem Characteristics
    • Leaf Type: Simple
    • Leaf Arrangement: Opposite; uppermost alternate 
    • Leaf Shape: Ovate
    • Stipules: Absent
  • Floral Characteristics
    • Flower Color: Green (Inconspicuous)
    • Flower Timing: August-October
    • Fruit Type: Achene



Soil Type Various
Habitat Moist, bare spots; borrow ditches, mudflats and exposed shorelines
Successional Stage Early, but occurs in all stages


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