ragweed - meaning and definition. What is ragweed
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What (who) is ragweed - definition

GENUS OF PLANTS
Ambrosia herbs; Ambrosia (genus); Bloodweed; Bursage; Hymenoclea; Ambrosia (plant); Acanthambrosia; Franseria; Gaertneria; Hemiambrosia; Hemixanthidium; Ambrosia hispida; Bur-sage
  • ''[[Ambrosia ambrosioides]]''
  • ''[[Ambrosia artemisiifolia]]'' pollen
  • ''[[Ambrosia chamissonis]]''
  • ''[[Ambrosia dumosa]]''

ragweed         
¦ noun a North American plant of the daisy family, with tiny green flowers. [Ambrosia artemisia.]
Ragweed         
·noun A common American composite weed (Ambrosia artemisiaefolia) with finely divided leaves; hogweed.
Ambrosia trifida         
SPECIES OF PLANT
Tall Ambrosia; Great Ragweed; Giant Ragweed; Buffalo Weed; Horse Cane; Great ragweed; Ambrosia aptera; Ambrosia integrifolia; Giant ragweed; Tall ambrosia; Buffalo weed; Horse cane
Ambrosia trifida, the giant ragweed, is a species of flowering plant in the family Asteraceae. It is native to North America, where it is widespread in Canada, the United States, and northern Mexico.

Wikipedia

Ragweed

Ragweeds are flowering plants in the genus Ambrosia in the aster family, Asteraceae. They are distributed in the tropical and subtropical regions of the Americas, especially North America, where the origin and center of diversity of the genus are in the southwestern United States and northwestern Mexico. Several species have been introduced to the Old World and some have naturalized and have become invasive species. Ragweed species are expected to continue spreading across Europe in the near future in response to ongoing climate change.

Other common names include bursages and burrobrushes. The genus name is from the Greek ambrosia, meaning "food or drink of immortality".

Ragweed pollen is notorious for causing allergic reactions in humans, specifically allergic rhinitis. Up to half of all cases of pollen-related allergic rhinitis in North America are caused by ragweeds.

The most widespread species of the genus in North America is Ambrosia artemisiifolia.

Examples of use of ragweed
1. The leading theory to explain the phenomenon holds that as modern medicine beats back bacterial, viral and parasitic diseases that have long plagued humanity, immune systems may fail to learn how to differentiate between real threats and benign invaders, such as ragweed pollen or food.