ALLERGY AND ASTHMA IN THE SOUTHWESTERN UNITED STATES 
slender ragweed image Ambrosia confertiflora -
Slimleaf Bursage, Slender Ragweed

 

Flowering Period in Southern Arizona:  April to November. 
Synonym for Ambrosia confertiflora is  A. tenuifolia   (Slender Ragweed)

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