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ragweed    音标拼音: [r'ægw,id]
n. 豕草类

豕草类

ragweed
n 1: widespread European weed having yellow daisylike flowers;
sometimes an obnoxious weed and toxic to cattle if consumed
in quantity [synonym: {ragwort}, {tansy ragwort}, {ragweed},
{benweed}, {Senecio jacobaea}]
2: any of numerous chiefly North American weedy plants
constituting the genus Ambrosia that produce highly
allergenic pollen responsible for much hay fever and asthma
[synonym: {ragweed}, {ambrosia}, {bitterweed}]


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  • Ragweed - Wikipedia
    Ragweeds are annual and perennial herbs and shrubs Species may grow just a few centimeters tall or exceed four meters in height The stems are erect, decumbent or prostrate, and many grow from rhizomes The leaves may be arranged alternately, oppositely, or both
  • How to Identify and Avoid Ragweed - The Spruce
    Ragweed is part of the Asteraceae family Ragweed grows tall and has nondescript flowers and ragged or palm-shaped foliage Ragweed seeds are beneficial wildlife food Ragweed has the life cycle of an annual summer weed There are two main types of ragweed: common ragweed and giant ragweed
  • Ragweed | Description, Plant, Pollen, Allergies, Species, Facts . . .
    ragweed, (genus Ambrosia), genus of about 40 species of weedy plants in the aster family (Asteraceae) Most species are native to North America Ragweed pollen, which is shed in great abundance in late summer, is the principal cause of hay fever in eastern and middle North America
  • Ragweed (Ambrosia artemisiifolia) Benefits and Uses: What It Does, How . . .
    Ragweed, most commonly Ambrosia artemisiifolia, is a late-summer flowering plant in the daisy family that inspires two very different conversations In everyday life, it is best known as a major source of seasonal allergy symptoms
  • Ragweed - Eat The Weeds and other things, too
    The common ragweed (Ambrosia artemisiifolia) can produce a million grains of pollen per plant daily, the Giant Ragweed (Ambrosia trifida) can create in excess of 1 25 million grains daily and over a billion during its life cycle
  • Common and Giant Ragweed Identification and Management
    Common ragweed (Ambrosia artemisiifolia) and giant ragweed (Ambrosia trifida) are two weed species that appear in many fields every year Both have become more prevalent in some areas and are getting harder to control because of herbicide resistance
  • Common ragweed | CALS
    Western ragweed (Ambrosia psilostachya DC ) is similar to common ragweed, however western ragweed is a perennial with a taproot The leaves of western ragweed are lance-shaped, and less finely divided than those of common ragweed
  • Common Ragweed - Tips to Beat Ragweed Season - Weekly Weeder #7
    We'll explain what common ragweed is, identify prime ragweed season, share some ragweed pictures, and talk about ragweed allergies and control
  • Ragweed Benefits and Important Considerations - Biology Insights
    Common ragweed (Ambrosia artemisiifolia) is widely recognized for its wind-borne pollen, a significant trigger for seasonal allergies However, this plant possesses characteristics and historical applications beyond its allergenic reputation
  • Identification and management of common ragweed (Ambrosia . . .
    Ragweed is found across the Midwest and Southern United States Since ragweed is an early emerging weed, management tactics must be implemented immediately to ensure profitable crop production





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