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Ragweed pollen is a common allergen. A single plant may produce about a billion grains of pollen per season, [ 11 ] [ 12 ] and the pollen is transported on the wind. It causes about half of all cases of pollen-associated allergic rhinitis in North America, where ragweeds are most abundant and diverse. [ 8 ]
A pollen count is a measurement of the number of pollen grains in a given volume of air. Pollen counts, and forecasts of pollen conditions, are routinely produced and reported to the public because high aerial pollen concentration is associated with increased rates of allergic reaction for those with conditions such as hay fever and asthma .
Its pollen is wind-dispersed, and can be a strong allergen to people with hay fever. [4] [10] It produces 2–4 mm obconic green to brown fruit. [9] It sets seed in later summer or autumn. Since the seeds persist into winter and are numerous and rich in oil, they are relished by songbirds and upland game birds. [4]
Finally, weed pollen from plants like mugwort, ragweed and sagebrush are most common in the fall months. Wichita ranked first in the country on all three pollen levels: tree, grass and weed.
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Ambrosia grayi, the woollyleaf bur ragweed, [3] is a North American species of plants in the family Asteraceae. It is native to the west-central part of the Great Plains of the United States, in the states of Nebraska, Kansas, Colorado, New Mexico, Oklahoma, and Texas. [4] Ambrosia grayi is a perennial herb up to 30 cm (12 inches) tall. Leaves ...
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