ragweed

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The Concise Oxford Dictionary of English Etymology

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ragweed

ragweed any plant of the genus Ambrosia, coarse, weedy herbs belonging to the family Asteraceae ( aster family), most of which are native to America. They have inconspicuous greenish flowers and soft subdivided leaves. Ragweeds are regarded as especially troublesome because their pollen is acknowledged as the primary cause of hay fever—especially the pollen of A. artemisiifolia (common ragweed) and A. trifida (great ragweed), the two most prevalent species in North America. The leaves of the common ragweed were formerly used as an astringent and hemostatic; they sometimes impart a bitter taste to milk if eaten by cattle. One variety ( elatior ) of this species has become widely naturalized in Europe. Ragweeds are classified in the division Magnoliophyta , class Magnoliopsida, order Asterales, family Asteraceae.

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ragweed

The Concise Oxford Dictionary of English Etymology | 1996 | | Â© The Concise Oxford Dictionary of English Etymology 1996, originally published by Oxford University Press 1996. (Hide copyright information) Copyright

ragweed XVII, ragwort XV. f. RAG1 + WEED1, WORT1; with ref. to the ragged form of the leaves.

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T. F. HOAD. "ragweed." The Concise Oxford Dictionary of English Etymology. 1996. Encyclopedia.com. 5 Jul. 2009 <http://www.encyclopedia.com>.

T. F. HOAD. "ragweed." The Concise Oxford Dictionary of English Etymology. 1996. Encyclopedia.com. (July 5, 2009). http://www.encyclopedia.com/doc/1O27-ragweed.html

T. F. HOAD. "ragweed." The Concise Oxford Dictionary of English Etymology. 1996. Retrieved July 05, 2009 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O27-ragweed.html

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Free newspaper and magazine articles

	Ragweed nothing to sneeze at.(LIVING) Newspaper article from: Telegram & Gazette (Worcester, MA); 8/21/2008
	Tips on surviving ragweed season. (Allergies).(Brief Article) Magazine article from: USA Today (Magazine); 8/1/2002
	Interaction of the onset of spring and elevated atmospheric C[O.sub.2] on ragweed (Ambrosia artemisiifolia L.) pollen production.(Research) Magazine article from: Environmental Health Perspectives; 6/1/2006

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	Ragweed nothing to sneeze at.(LIVING) Newspaper article from: Telegram & Gazette (Worcester, MA); 8/21/2008; 534 words ; ...to 4 feet tall. This common pest is ragweed, Ambrosia artemisiifolia, commonly found...and in waste places. Several kinds of ragweed are found throughout the country, but our concern is for common ragweed. Likely due to the frequent rains, tall... Read more
	Tips on surviving ragweed season. (Allergies).(Brief Article) Magazine article from: USA Today (Magazine); 8/1/2002; 229 words ; ...with allergies that means the three Rs --ragweed, runny noses, and rhinitis--warns Richard...offers the following tips on how to keep ragweed pollen at bay: * Start allergy medications prior to ragweed pollen levels becoming severe. Take an... Read more
	Interaction of the onset of spring and elevated atmospheric C[O.sub.2] on ragweed (Ambrosia artemisiifolia L.) pollen production.(Research) Magazine article from: Environmental Health Perspectives; 6/1/2006; ; 700+ words ; ...biomass, reproduction, and phenology in ragweed plants (Ambrosia artemisiifolia L.), which...highly allergenic pollen. We released ragweed seeds from dormancy at three 15-day intervals...with ambient C[O.sub.2] levels. Overall, ragweed pollen production can be expected to increase... Read more
	Ragweed subpollen particles reach deep into lungs.(Allergies)(Report) Magazine article from: Environmental Health Perspectives; 4/1/2007; ; 384 words ; ...same research team recently reported that ragweed pollen grains contain intrinsic NAD(P...cells after exposure to hydrated short ragweed (Ambrosia artemisiifolia) and redroot...applied SPPs. The researchers found that ragweed pollen grains release SPPs in the size... Read more
	Allergies triggered by change of season. Magazine article from: AORN Journal; 10/1/2002; 350 words ; Ragweed season has begun, according to an Aug 9, 2002, news release...American Academy of Allergy, Asthma, and Immunology (AAAAI). Ragweed is a plant that releases the pollen most responsible for...Americans suffer from seasonal rhinitis, which is triggered by ragweed: With days becoming shorter and nights ... Read more
	Dear EarthTalk: is it true global warming can exacerbate allergies? Magazine article from: EarthTalk: Questions & Answers About Our Environment. A Weekly Column; 10/28/2007; ; 523 words ; ...Wheezing: How Global Warming Could Increase Ragweed Allergies, Air Pollution and Asthma details how ragweed, one of the most common allergens in the...temperatures rise due to climate change. Ragweed also thrives on direct exposure to carbon... Read more
	[CO.sub.2] Could Aggravate Allergies.(Brief Article)(Statistical Data Included) Magazine article from: Agricultural Research; 11/1/2000; ; 141 words ; ...atmospheric [CO.sub.2] may be an increase in ragweed pollen. Researchers have made pollen counts on ragweed grown in indoor chambers at various levels...moved outside, with researchers checking on ragweed pollen production in urban, suburban, and... Read more
	Southwestern allergist suggests techniques to control fungus. (Rebecca S. Gruchalla) Newspaper article from: Nutrition Health Review; 3/22/1994; 700+ words ; DALLAS, TEXAS: Ragweed and other pollens come and go with the changing of the seasons. But...molds in mid to late summer, between the seasons for grass pollen and ragweed. Spores produced outside become widely dispersed through the air and... Read more
	Breathing a little easier. (asthma treatment with steroid nasal inhalers) Newspaper article from: Medical Update; 8/1/1990; 488 words ; BREATHING A LITTLE EASIER Once again the ragweed season is upon us, and if you are among the 10 percent or so of Americans sensitive to ragweed pollen, we refer you to out April issue, in which we urged you to ask your physician about steroid nasal... Read more
	Onset of action of ciclesonide once daily in the treatment of seasonal allergic rhinitis.(ORIGINAL ARTICLE)(Clinical report) Magazine article from: Ear, Nose and Throat Journal; 6/1/2008; ; 700+ words ; ...500 grains/[m.sup.3] ([+ or -] 500) of ragweed pollen in an environmental exposure chamber...to require further treatment during the ragweed season. To be eligible for this study...have demonstrated sensitivity to short ragweed pollen (determined by a positive skin... Read more