ALLERGY AND ASTHMA IN THE SOUTHWESTERN UNITED STATES 

Ash trees develop unattractive flowers in the spring
- photo of Fraxinus velutina 'Rio Grande' February 19

Arizona Ash flowers
See flowers develop in photos of the same tree taken February 23, March 2 and March 3.  Deciduous trees in Southern Arizona flower earlier than in colder climates.  Note that the flowers develop faster than the leaves.

Content Owner:  Michael J. Schumacher, MB, FRACP  
                            University of Arizona  
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