The oaks shed copious amounts of pollen, more than all other plants, where the trees are abundant. Oaks are present in all states, except Alaska and Hawaii, and are particularly prevalent in the southeastern and southwestern states. In Canada many species of oak are found in Ontario, Quebec and the Maritimes. The prairies have fewer species. British Columbia has one species common to the southwestern coastline. They are an important cause of allergic reactions. Pollen is released in February and March in the South and April, May and June in the North. Some of the antigens cross-react with each other while others are unique to their own species of oak.
Last Updated: 14 Octoberber 2009
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