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Perennial Ragweed (Ambrosia psilostachya)

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Home « Louisiana « Morehouse « Ambrosia « Ambrosia psilostachya
Family: ASTERACEAE
Genus: Ambrosia
Species: Perennial Ragweed (Ambrosia psilostachya)

Perennial Ragweed Species Description

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This species is native to North America north of Mexico.

Allergenicity: Perennial Ragweed (Ambrosia psilostachya) is a severe allergen.

Pollination: Occurs in following seasons depending on latitude and elevation: Spring to Fall.

Angiosperm - Flowering Dicot: Plants in this group have two embryonic leaves (dicotyledons). Examples of dicotyledons are beans, buttercups, oaks, sunflowers, etc.

Forb: A broad-leaved herb other than a grass, especially one growing in a field, prairie, or meadow.

Weed: Any plant growing in cultivated ground to the injury of the crop or desired vegetation, or to the disfigurement of the place; an unsightly, useless, or injurious plant.

Annual: Plants in which the entire life cycle is completed within one growing season.

Perennial: Living for many years.

State Noxious Weed: unpleasant and possibly also harmful.

Wetland Plant: Plants growing in aquatic or wetland habitats. These include all known floating, submerged, and emergent taxa, plus those that are found in permanently or seasonally wet habitats.

Herbaceous Stem: Not woody, lacking lignified tissues.

Perennial Ragweed Species Usage

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Pharmacological: Used in medicine or pharmacological research.

Honey/Bee Pollen: A plant used as a source of food for Honey Bees, and may be a flavor of honey such as clover or alfalfa.

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Perennial Ragweed Species Location

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The shaded areas on the map indicates where the species has been observed in the United States. Click the map to see a full scale version of these allergy areas.
  - Native, observed in a county
  - Introduced, observed in a county
  - Rarely observed
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