Oak
Family: Fagaceae Common name: Encina, roble Allergenic: No Peak season: March — June
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Plant image 
Scanning electron microscopy — Source: Red Palinocam, Comunidad de Madrid Description
The genus Quercus (family Fagaceae) includes holm oaks (Q. ilex), oaks (Q. robur, Q. pyrenaica), cork oaks (Q. suber) and Portuguese oaks (Q. faginea).
Habitat and distribution
Widespread in the Community of Madrid. Quercus ilex is the most common tree in the Iberian Peninsula.
Health impact
Pollination from March to June. They produce enormous amounts of pollen but their allergenicity is moderate.
Cross-reactivity
Cross-reactivity among different Quercus species and with chestnut and beech, from the same Fagaceae family.
Pollen morphology
Tricolpate-tricolporate pollen grain, prolate, 20-30 μm. Verrucate-granular surface.
Did you know?
Centennial holm oaks can produce billions of pollen grains each spring.
The information on this page is for educational purposes. For any questions about allergies, consult your doctor or allergist.