Ambrosia trifida

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Ambrosia trifida
Ambrosia trifida (inflorescences).jpg
Conservation status

Secure (NatureServe)
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Asterids
Order: Asterales
Family: Asteraceae
Tribe: Heliantheae
Genus: Ambrosia
Species: A. trifida
Binomial name
Ambrosia trifida
L. (1753)[1]

Ambrosia trifida is a species of flowering plant in the aster family, Asteraceae. It is native to North America, where it is widespread in Canada, the United States, and northern Mexico. It is present in Europe and Asia as an introduced species, and it is known as a common weed in many regions.[2] Its common names include great ragweed, Texan great ragweed, giant ragweed, tall ragweed, blood ragweed, perennial ragweed, horseweed,[3] buffaloweed, and kinghead.[4]

Description[edit]

This is an annual herb usually growing up to 2 meters tall, but known to reach 6 meters in rich, moist soils. The tough stems have woody bases and are branching or unbranched.[4] Most leaves are oppositely arranged. The blades are variable in shape, sometimes palmate with five lobes, and often with toothed edges. The largest can be over 25 centimeters long by 20 wide. They are borne on petioles several centimeters long. They are glandular and rough in texture. The species is monoecious, with plants bearing inflorescences containing both pistillate and staminate flowers. The former are clustered at the base of the spike and the latter grow at the end. The fruit is a bur a few millimeters long tipped with several tiny spines.[1][5]

As a weed[edit]

This species is well known as a noxious weed, both in its native range and in areas where it is an introduced and often invasive species. It is naturalized in some areas, and it is recorded as an adventive species in others.[2] It grows in many types of disturbed habitat, such as roadsides, and in cultivated fields. Widespread seed dispersal occurs when its spiny burs fall off the plant and are carried to new habitat by people, animals, machinery, or flowing water. The plant is destructive to native and crop plants because it easily outcompetes them for light.[4]

As an allergen[edit]

There is also great interest in preventing the spread of this plant because its pollen is a significant human allergen.[6] It is one of the most familiar allergenic ragweeds, and residents of different regions begin to experience allergic symptoms as the plant spreads into the area.[7]

Uses[edit]

Native Americans had a number of uses for the plant as traditional medicine. The Cherokee used it as a remedy for insect stings, hives, fever, and pneumonia, and the Iroquois used it to treat diarrhea.[8]

Giant ragweed has been used successfully as a compost activator and an ingredient in sheet mulch gardens.[9]

Gallery[edit]

References[edit]

  1. ^ a b Ambrosia trifida. Flora of North America.
  2. ^ a b Ambrosia trifida. Germplasm Resources Information Network (GRIN).
  3. ^ Ambrosia trifida. Integrated Taxonomic Information System (ITIS).
  4. ^ a b c Ambrosia spp. Encycloweedia. California Department of Food and Agriculture.
  5. ^ Ambrosia trifida. The Jepson eFlora 2013.
  6. ^ Ghosh, B., et al. (1991). Cloning the cDNA encoding the AmbtV allergen from giant ragweed (Ambrosia trifida) pollen. Gene 101(2), 231-38.
  7. ^ Makra, L., et al. (2005). The history and impacts of airborne Ambrosia (Asteraceae) pollen in Hungary. Grana 44(1), 57-64.
  8. ^ Ambrosia trifida. Native American Ethnobotany. University of Michigan, Dearborn.
  9. ^ Stallings, Ben. "Ragweed: Curse or Blessing, the Choice is Yours". Permaculture News. Permaculture Research Institute. Retrieved 27 June 2014. 

External links[edit]