Learn more about pollen - Rye Grass

Rye Grass (Species, Lolium perenne; Family, Gramineae)

Rye grass (Lolium perenne) in native to north Africa, Europe and western Asia. This perennial ryegrass is grown as a pasture grass and is also deliberately planted in recreation areas in the temperate regions of Australia. It often becomes naturalised in agricultural areas, along roadsides and near habitation, but also invades a wide variety of natural habitats.

Many introduced pasture grasses are the worst offenders whe it comes to triggers for hay fever. There are hundreds of types of grasses. Types that often trigger allergies include: Bermuda grass, Aleppo grass, Rye grass, Meadow grass, Sweet vernal grass, and Cock's-foot grass. The southern temperate grasses tend to produce pollen from October through to December. There is a second season of grass pollen production in January and February dominated by the warm temperate grass species. Examples of the distributions of these different grass species are illustrated below.

Distribution of Key Allergenic Grass species including Rye Grass (Atlas of Living Australia occurence map)

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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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