Tree pollen is dominant in the Spring. There are 115 species of maple trees, ten of which are native to North America.
Maples are medium to small deciduous trees with watery sap which is sometimes sugary.
Most of the North American Acer species are pollinated by both insects and the wind. Maple allergenicity All maple pollen is highly allergenic . Box elder is the only species pollinated solely by the wind and therefore produces copious amounts of pollen. It is regarded as the most allergenic spring tree pollen causing the most problems for hay-fever sufferers. Box elder is the fastest growing tree common in the Midwest and is the most potent member of the maple family.