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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 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
  • Arizona Allergy Map | Pollen. com
    Search, browse and select cities on our interactive allergy map to see allergy levels and pollen count forecasts Most allergy management suppresses your reaction — but nothing stops you from inhaling the pollen that triggers it A clinically tested wearable device is changing that
  • 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
  • Prescott Valley, AZ Ragweed Pollen Allergen Forecast | AccuWeather
    Ragweed pollen makes your allergies bloom? Don't spend your day suffering and be prepared Get your local ragweed pollen allergy forecast
  • 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
  • Todays Pollen Count - The Weather Channel
    Today’s Pollen Count tracks ALL pollen, while Pollen Breakdown covers specific pollens like ragweed So when overall pollen is low, a specific pollen could be high
  • Ragweed Pollen Allergy | AAFA. org
    Ragweed and goldenrod are two types of plants that look very similar While ragweed can cause allergy symptoms, goldenrod attracts insect pollinators, such as bees
  • 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





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