Hazel (Corylus)	Alder (Alnus)
Yew and Cypress family (Taxus & Cupressaceae)	Willow (Salix)
Poplar (Populus)	Ash (Fraxinus)
Hornbeam (Carpinus)	Birch (Betula)
Plane (Platanus)	Oak (Quercus)
Beech (Fagus)	Pine, spruce and cedar (Pinaceae)
Horse chestnut (Aesculus)	Linden (Tilia)
Sweet chestnut (Castanea sativa)

Sorrels and docks (Rumex)	Plantain (Plantago)
Grasses (Poaceae)	Lamb’s quarter (Amaranthaceae)
Nettle's family (Urticaceae)	Mugwort (Artemisia)

AirAllergy.be
Belgian Aerobiological Surveillance Network

Allergenic Plants