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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 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 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
  • 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 | Cornell Weed Identification
    Common ragweed (Ambrosia artemisiifolia) is a widespread and common agricultural, waste area, and garden weed in New York It is a summer annual, can cause significant crop loss if left unmanaged for 2-3 weeks after planting, and is the main late-summer allergen in the US
  • Ragweed - Identify that Plant
    There are two ragweeds found throughout North America: Common ragweed (Ambrosia artemisiifolia) and Great ragweed (Ambrosia trifida) Let’s start with Great ragweed (pictured above) and study its parts and life cycle
  • 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
  • Ragweed - University of Maryland Extension
    Ragweed is to blame for the allergies often erroneously contributed to goldenrod





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