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Cyclachaena

Scientific Name: Cyclachaena

Family: Asteraceae

Category: Dicot

Growth:

Duration:

Other Names:

       

Giant Sumpweed (Cyclachaena xanthiifolia)

Cyclachaena xanthiifolia, commonly known as Giant Sumpweed or Carelessweed, is a plant species belonging to the sunflower family.

Considerations for Pets

  • This plant is described as a "coarse" plant that can grow to over 6 feet tall.
  • It is also described as a "weedy-looking plant".
  • The plant produces nuts.

Taxonomy and Nomenclature

  • Scientific Name: Cyclachaena xanthiifolia (Nutt.) Fresen.
  • Family: Asteraceae (Sunflower family), also referred to as Compositae.
  • Synonyms: Iva xanthiifolia Nutt.
  • Taxonomic Rank: Species

Distribution and Habitat

  • Believed to be native to the Great Plains of North America.
  • Now found more widely distributed across North America.
  • Also found in the Southern Urals and Cisural region.
  • Occurs regularly in Canada.

Ecological Role

  • Characterized as an annual, late-summer weed.
  • Its range has greatly increased both to the west and east in North America.

Morphological Characteristics

  • Large, coarse annual, growing up to 20 dm (approximately 6.5 feet) tall.
  • Stems are smooth and unbranched.
  • Leaves are long-petiolate, with broadly ovate blades, typically 5-20 cm long and 2.5-20 cm wide.
  • Flowers are dense, branching clusters of 1/8-inch green to yellowish disk-shaped flowers.

Interactions with Other Organisms

  • The plant is described as a nut producing angiosperm.

Additional Information

  • Also referred to as False Ragweed, Burweed Marshelder, Giant Marshelder, Horseweed and Marshelder.
  • Etymology: The genus name Iva is derived from the Latin name for the mint Ajuga iva, which has a similar aroma.

Further Information

  • USDA PLANTS Database: http://plants.usda.gov
  • MICHIGAN FLORA ONLINE
  • African National Biodiversity Institute
  • Les conservatoire et jardin botaniques de la Ville de Genve
  • The Plant List
  • IPNI (International Plant Names Index)
  • NYBG (New York Botanical Garden) Virtual Herbarium
  • Discover Life
  • CalPhotos