Ragweed
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Ragweeds are flowering plants in the genus Ambrosia in the aster family, Asteraceae. They are distributed in the tropical and subtropical regions of the Americas, especially North America, where the o
Ambrosia psilostachya kz 1
Ambrosia artemisiifolia pollen
Ambrosia dumosa
Ambrosia chamissonis
Ambrosia trifida
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Ambrosia trifida, the giant ragweed, is a species of flowering plant in the family Asteraceae. It is native to North America, where it is widespread in Canada, the United States, and northern Mexico.
Ragweed
…pollen-associated allergic rhinitis in North America, where ragweeds are most abundant and diverse. Common culprits are common ragweed (A. artemisiifolia) and great ragweed (A. trifida). Concentration of ragweed pollen—in the absence of significant rainfall, which removes pollen from the air- is the lowest in the early…
Ambrosia trifida
Habit
Inflorescence
Tall specimen in Texas