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Southwestern United States
Information for patients with allergy and related problems
in the Southwest

Tucson Pollen Today and Tomorrow - April

Weeks 1 & 2:   Important sources of allergenic pollen at this time are Ambrosia deltoidea (triangle leaf bursage, rabbit bush), and Ambrosia ambrosiodes (canyon ragweed), both of which are flowering at this time. Bermuda grass and other grasses are also releasing pollen now.  Later in the month, Mulberry trees will flower. Olive trees will flower in the next 2 weeks.   Cercidium spp (Palo Verde) will soon produce enormous numbers of yellow flowers that liberate pollen.  Fortunately this pollen has relatively low allergenicity.  Mesquite is beginning to leaf out will bloom before the end of the month.  The yellow flowers of  Acacia species are only weakly allergenic. Other yellow flowers that will soon be highly visible and will produce some airborne pollen are displayed by plants of unknown allergenicity.  These include Larrea tridentata (Creosote Bush), and members of the Compositae family such as Encelia farinosa (brittle-bush) and Baileya multiradiata (desert baileya, desert marigold). 

Note:   This information is based on ongoing observation of flowering allergenic plants in the Tucson metropolitan area, and not on pollen counts.   Appearance and persistence in the air of any particular species of airborne pollen are expected to be later than the onset and duration of flowering of the plant of origin.                                            Back


Disclaimer:   This site is for educational purposes only.  Any information that you have found in this web site is not intended to replace medical care or advice given to you by your own physicians. You should consider consulting your local medical library and other web sites for additional information. 

Comments and suggestions welcome!   Email: schumach@u.arizona.edu
Content Owner:  Michael J. Schumacher, MB, FRACP, The University of Arizona
Updated 3-29-2013