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Ambrosia artemisiifolia pollen. 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]
The species name, artemisiifolia, is given because the leaves were thought to bear a resemblance to the leaves of Artemisia, the true wormwoods. It has also been called the common names: American wormwood, bitterweed, blackweed, carrot weed, hay fever weed, Roman wormwood, short ragweed, stammerwort, stickweed, tassel weed.
Widespread seed dispersal occurs when its spiny burs fall off the plant and are carried to new habitat by people, animals, machinery, or flowing water. The plant is destructive to native and crop plants because it easily outcompetes them for light. [5] Herbicide resistant giant ragweed populations were first identified in the late 1990s. [10]
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They freely expel a myriad of these pollen grains, and only a small percentage of them ends up captured by the female floral structures on wind-pollinated plants. [3] They are typically 20–60 micrometres (0.0008–0.0024 in) in diameter, although the pollen grains of Pinus species can be much larger and much less dense. [ 1 ]
Fish allergy is an immune hypersensitivity to proteins found in fish.Symptoms can be either rapid or gradual in onset. The latter can take hours to days to appear. The former may include anaphylaxis, a potentially life-threatening condition which requires treatment with epinephrine.
Chamomile, a relative of ragweed, can cause allergy symptoms and can cross-react with ragweed pollen in individuals with ragweed allergies. [2] [12] Contact dermatitis may occur when touching the plant. [2] When consuming the tea, there is potential for drug interactions with anticoagulants. [2]
Ambrosia psilostachya is a host plant for the caterpillars of Bucculatrix transversata, [13] Cosmopterix opulenta, Exaeretia gracilis, Gnorimoschema saphirinella, [14] Schinia sexplagiata; the beetles Calligrapha disrupta, Calligrapha suturalis; [15] and the grasshopper Spharagemon collare. [16]