Maple
Scanning electron microscopy — Source: Red Palinocam, Comunidad de Madrid Description
The genus Acer (family Sapindaceae) includes native species in Madrid like the Montpellier maple (A. monspessulanum) and field maple (A. campestre), plus widely planted ornamentals such as sycamore maple (A. pseudoplatanus), Norway maple (A. platanoides) and box elder (A. negundo). Deciduous trees with opposite, generally palmate leaves. Small flowers appear in racemes or corymbs at the same time or just before the leaves.
Habitat and distribution
Widely planted as ornamentals in parks, gardens and urban avenues. Montpellier maple grows naturally on limestone slopes in the sierra. Common in El Retiro, periurban parks and northwestern residential areas.
Health impact
Pollination March-May. Low allergenicity, as several species are partially insect-pollinated. Box elder (A. negundo) is wind-pollinated and may contribute to spring allergenic load. Can cause mild rhinoconjunctivitis with sneezing, nasal itching and tearing in sensitized patients.
Cross-reactivity
Low cross-reactivity with other pollen types. Some cross-reaction within the genus between different Acer species.
Pollen morphology
Tricolpate pollen grain, spheroidal to slightly prolate, 25-30 μm. Long narrow colpi. Striate (striate-reticulate) surface with striae parallel to colpi, giving a very characteristic microscopic appearance. Exine 1.5-2 μm thick.
Did you know?
Maple samaras (double-winged fruits) spin like helicopters when falling, a mechanism so efficient it has inspired aeronautical engineering. The maple leaf is Canada's national symbol.
The information on this page is for educational purposes. For any questions about allergies, consult your doctor or allergist.