|Allergy and Asthma
Southwestern United States
||Information for patients with allergy and related
in the Southwest
Tucson Pollen Today and Tomorrow - November
Grasses have been flowering for several months. Bermuda grass (Cynodon dactylon), established in alleys and roadsides, is drying up and unless irrigated will finish releasing pollen. Other non-native grasses such as Pennisetum ciliare (Buffel Grass) and native grasses such as Aristida (Threeawn) and Bouteloua (Grama Grass) have flowered extensively, and are now dormant.
Baccharis (Desert Broom) has been
releasing pollen from the male flowers, and the tufted seeds maturing in the female
flowers will fly in the wind in a few weeks' time. Mold growth in the soil during
the monsoon is yielding airborne spores now that the surface layers of soil are starting
to dry up.
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
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