ALLERGY AND ASTHMA IN THE SOUTHWESTERN UNITED STATES 

Russian Thistle (Tumbleweed)  - Salsola kali 
 tumbleweed image 
 AHSC logo    Flowering period in Southern Arizona:  May-November        Widespread throughout N. America.  Also known as Tumbleweed                 
                                                                                                  Photo by Michael J Schumacher 1999   
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