Where the tree is present, reactions to olive pollen are common, and typically severe.
The leaves of olive trees are opposite and usually evergreen in the southern parts of the United States. The tree is small (up to 25 feet) and spreading. The flowers appear in the spring and are white, small and fragrant.
Pollen grains are prolate, suboblate to spheroidal and 3-colpate. The surface is reticulate and the exine is thick.
Pollen grains vary in size from 22-28 micrometers.
The shaded areas on the map indicates where the genus has been observed in the United States.
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