This group includes the fir, pine, spruce, hemlock and the tamarack. Although copious amounts of pollen become airborne for all of the trees in this family allergic reactions are not common. It is necessary to note that allergies to this group of trees do occur and can be severe for those who are sensitized. More consideration is being given to the importance of this group in causing allergic reactions. The distribution is throughout North America but the kinds of trees found in each province or state varies. The pollination season can be from March to July depending on the geographic location. The hemlocks, which are common along the pacific coast of North America, are suspected of causing hay fever when released in large amounts. The Tsuga species, or hemlocks, can cause allergic reactions. The Eastern hemlock, which is common from Western Ontario to Newfoundland, pollinates in May. The western hemlock, common along the Pacific coastline, flowers in April and May. The mountain hemlock, found in the most western parts of North America, flowers in April and May.
Last Updated: 20 December 2000
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