|Allergy and Asthma
Southwestern United States
||Information for patients with allergy and related
in the Southwest
Tucson Pollen Today and Tomorrow - May
Weeks 1 & 2: Cercidium spp (Palo Verde trees) are Olive trees are flowering now. Some varieties of Mesquite trees are starting to form flowers. Yellow-flowering plants that that have been visible in the past few weeks include Encelia farinosa (brittle-bush) and Baileya multiradiata (desert baileya, desert marigold). These flowers in the Compositae family produce some airborne pollen, but as with Palo Verde pollen, their allergenicity is not established. The highly allergenic Ambrosia deltoidea (triangle leaf bursage, rabbit bush) and Ambrosia ambrosiodes (canyon ragweed) are still releasing pollen. Male Mulberry trees and Arizona Ash are at the end of their flowering period. Bermuda grass has been flowering for at least 2 months.
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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