Scientific details

SCIENTIFIC NAME: Ambrosia psilostachya

 COMMON NAME(S): Perennial ragweed, Western ragweed
SYNONYM(S): Ambrosia coronopifolia Torr. & Gray
FAMILY: ASTERACEAE (COMPOSITAE) - Sunflower Family
ORIGIN: Western United States
HABITAT: Dry
RANGE: Throughout United States and Canada except far north
TYPE: Perennial herb with creeping rootstock (occasionally annual)
HEIGHT: 4-5'
CHARACTERISTICS:
LEAVES: Alternate, simple but deeply lobed, to 4" long; rough to the touch
FLOWERS: Tiny in small heads, male and female flowers in separate heads on the same plant
FLOWERING SEASON: Late summer to fall
FRUITS: Small, single-seeded, four blunt nobs at the top of each fruit

ALLERGENIC COMPONENTS: Pollen, foliage
ALLERGENIC PRINCIPLES: Pollen allergens, oleoresins
ALLERGENIC PROPERTIES: Respiratory and dermatitis
COMMENTS:

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