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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
  • Ragweed | AZ Invasive Plants
    There are several different species of native ragweed (Ambrosia spp ) in northern Arizona which look similar to each other They all share the same weedy characteristics, reasons for concern, and control strategies
  • 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 Allergy: Facts, Symptoms, Treatment - WebMD
    If your allergies flare in late summer or early fall, you may be allergic to ragweed WebMD explains the symptoms and treatment, and how you can avoid your triggers
  • Ragweed Allergies - Allergy Asthma Network
    Ragweed season begins in early August and peaks in mid-September and October before declining in November Ragweed pollen allergy is a leading cause of seasonal allergic rhinitis (also called hay fever), which affects more than 23 million people in the United States
  • Where Does Ragweed Come From? Origins and Spread
    Ragweed is native to North America and has spread worldwide, bringing longer pollen seasons and widespread allergies along the way
  • Ragweed Season: What You Need to Know - oklahomaallergy. com
    Unfortunately, there are 17 different types of ragweed that grow in North America Most types have greenish flowers that grow on tall spikes and branch out from the ground up Ragweed appears in both rural areas and cities It’s often spotted along roadsides, riverbanks and empty lots or fields
  • Ragweed Plants Packed with Pollen
    The AAAAI offers information on ragweed and hay fever symptoms, diagnosis treatments
  • What Does Ragweed Look Like? (Pictures Identification Tips)
    Common ragweed (Ambrosia artemisiifolia) is everywhere This annual weed usually grows 1-3 feet tall (0 3-0 9 m) with fern-like leaves that look lacy and delicate The stems themselves can be green or slightly reddish, usually covered with fine hairs that give the plant a slightly fuzzy texture





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