Scientific name:
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Franseria acanthicarpa (Hook.) Coville |
Family name latin:
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Asteraceae |
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| Description: |
Annual, strongly branched, widespreading herb, reaching a height of up to about one meter. It has mugwort-like, pinnated and lobated, alternately arranged leaves; the plant is monoecious, however the head is single-sexed; male flowers in greenish, nodding flower heads are united to numerous terminal inflorescence clusters; amongst them the female flower heads; anemogamous; flowering time: VI – X.
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| Occurence: |
On sandy soils, in river valleys and along road sides in the central and Western states of the USA.
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| Related species: |
Closely related to the Ambrosia species;
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| Allergy trigger: |
Pollen, around 20 µm;
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| Invasions path: |
Inhalation (June – October)
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| Synonyms: |
Ambrosia acanthicarpa Hook., gaertneria acanthicarpa (Hook.) Britt., false ragweed, annual bur-weed, sand-bur
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| Allergology: |
In the actual area of natural occurrence, it is a very prominent inhalation allergen. The pollen of most ambrosia relations, including franseria, possess common major allergens. In general, high cross-reactivity must be assumed to exist within the entire family of the asteraceae. There is therefore an antigen community between ambrosia pollen and the unrelated foodstuffs melon and banana. Exposing humans to ambrosia pollen during neonatal development poses a predisposing risk factor favoring a later sensitization against ambrosia pollen.
It is typical of ambrosia allergies that the allergy sufferers often experience symptoms even after the time of peak pollen count.
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| Immunology: |
Main allergen corresponds to: Amb a I, MG 37 800;
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| Clinical relevance: |
middle
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| Cross reactivities: |
Occurrence possible- Ragweed, giant
- Ragweed, western
- Ragweed, common
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