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Ambrosia trifida, the giant ragweed, is a species of flowering plant in the family Asteraceae. It is native to North America , where it is widespread in Canada , the United States , and northern Mexico .
Ragweed pollen can remain airborne for days and travel great distances, and can even be carried 300–400 miles (500–600 km) out to sea. [12] Ragweeds native to the Americas have been introduced to Europe starting in the nineteenth century and especially during World War I , and have spread rapidly since the 1950s. [ 15 ]
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Ambrosia psilostachya is a species of ragweed known by the common names Cuman ragweed and perennial ragweed, [4] and western ragweed. Distribution and habitat [ edit ]
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Ambrosia acanthicarpa is a North American species of bristly annual plants in the family Asteraceae.Members of the genus Ambrosia are called ragweeds.The species has common names including flatspine bur ragweed, [3] Hooker's bur-ragweed, [4] annual burrweed, annual bur-sage, and western sand-bur.
Ambrosia chamissonis is a species of ragweed known by the common names silver burr ragweed, silver beachweed and (silver) beach bur(r). [ 3 ] It is known from most of the coastline of western North America from Alaska to Baja California , where it is a resident of beaches and other sandy coastal habitats.