Learn more about pollen - Plane tree

Plane tree (Species, Platanus sp.; Family, Platanaceae)

The Plane tree or Platanus sp. is a genus comprising a small number of tree species native to the Northern Hemisphere. They are the sole living members of the family Platanaceae. The trees are tall, reaching 30–50 m and they are deciduous. The hybrid London Plane has proved particularly tolerant of urban conditions. They are wind-pollinated and produce large amounts of pollen during September and October.

Plane tree pollen is capable of causing hay fever and bronchial asthma.

Distribution of Plane tree (Atlas of Living Australia occurrence map)

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Learn more about pollen - Elm

Elm (Species, Ulmus sp.; Family, Ulmaceae)

Elms occur naturally in the northern hemisphere temperate zones and at higher altitudes in the subtropics. Most are trees, some of which are very large and are deciduous and semi-deciduous. They are wind-pollinated and produce large amounts of pollen during September.

The planting of elms in Australia began in the first half of the 19th century when European settlers imported species from their former homelands. Owing to the demise of elms in the northern hemisphere as a result of the Dutch elm disease pandemic, the mature trees in Australia's parks and gardens are now regarded as amongst the most significant in the world. The pollen from Ulmus sp. does produce an allergic reaction in some people, and has been widely reported as a cause of hay fever in Europe and in North America.

Distribution of Dutch Elm (Atlas of Living Australia occurrence map)

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Learn more about pollen - Birch

Birch (Species, Betula sp.; Family, Fagaceae)

The main species planted across Canberra in gardens and parklands is the Silver Birch (Betula pendula), which is a medium-sized deciduous tree, typically growing up to 25 metres high. It is noted for its slender trunk, white bark, and beautiful yellow leaves in autumn. Its flowers are drooping catkins, which produce large amounts of wind-blow pollen between August and October.

In northern latitudes, birch is considered to be the most common allergenic tree pollen, with an estimated 15–20% of people with hay fever sensitive to birch pollen grains. Cross-reactivity between birch and certain foods is also a common phenomenon. People with birch pollen allergies may react to kiwi, apples, pears, peaches, plums, coriander, fennel, parsley, celery, cherries, carrots, hazelnuts and almonds.

Distribution of Birch (Atlas of Living Australia occurrence map)

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