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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

    Vegetative

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

    Floral

    • 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

 

 

Habitat/Ecology  
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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