Ragweed pollen, Ambrosia psilostachya, coloured scanning electron micrograph (SEM). This pollen is an allergen. Ragweed is a main cause of weed allergies. Ragweed pollen is notorious for causing allergic reactions in humans, specifically allergic... Stock Photo

Stock Photo - Ragweed pollen, Ambrosia psilostachya, coloured scanning electron micrograph (SEM). This pollen is an allergen. Ragweed is a main cause of weed allergies. Ragweed pollen is notorious for causing allergic reactions in humans, specifically allergic.... Fotosearch

Ragweed pollen, Ambrosia psilostachya, coloured scanning electron micrograph (SEM). This pollen is an allergen. Ragweed is a main cause of weed allergies. Ragweed pollen is notorious for causing allergic reactions in humans, specifically allergic...

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