Scientific name:
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Iva ciliata (Willb.) |
Family name latin:
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Asteraceae |
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| Description: |
Annual herb, reaching a height of up to over 2 m, hairy and strongly branched; long-stemmed leaves, up to 15 cm long and 7 cm wide, running to a point, saw-toothed and alternately arranged in the lower region; flowers in small, greenish-white flower heads; these are united in many terminal, spiciform partial inflorescences; anemogamous and entomogamous; flowering time: VII - X;
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| Occurence: |
Mainly in central and Eastern North America, especially in the Mississippi valley; in ruderal locations, fallow land, moist soils and river valleys; no occurrence in Europe.
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| Related species: |
Iva xanthifolia Nutt.; bur-weed, marsh elder, or giant sump-weed, ruderal plant of Northwestern America; introduced to areas around some trainstations and ports in Europe (VII - IX); Iva frutescens L.; marsh-elder, a salt tolerant sea shore plant of Northeastern America (VIII - X);
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| Allergy trigger: |
Pollen; 20 µm
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| Invasions path: |
Inhalation (July - October)
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| Synonyms: |
Iva annua L., Iva caudata Small.; Rough Marsh Elder;
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| Allergology: |
The species does not occur in Central Europe. In its natural habitat however it is not an insignificant inhalation allergen, since each plant releases about a billion pollen. Cross reactions are known to exist to the entire Asteraceae family.
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| Clinical relevance: |
light
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