Sorrel
Description
The genus Rumex (family Polygonaceae) includes sorrels (R. acetosa, R. acetosella) and docks (R. crispus, R. pulcher). Perennial herbs with basal hastate or sagittate leaves, striated stems and flowers in whorled panicles. Fruits are triangular achenes enclosed in valves. Over 200 species worldwide, about 20 in the Iberian Peninsula.
Habitat and distribution
Moist meadows, riverbanks, roadsides and wet areas. Common throughout the Madrid region, especially in sierra foothills and river valleys (Manzanares, Jarama, Henares).
Health impact
Pollination March-July, peaking May-June, overlapping with grasses. Moderate but clinically significant allergenicity in polysensitized patients. Causes rhinoconjunctivitis with nasal congestion and can exacerbate asthma.
Cross-reactivity
Low cross-reactivity with other pollen types. Co-sensitization with grasses and Plantago is common due to seasonal overlap.
Pollen morphology
Tricolporate pollen grain, spheroidal to slightly prolate, 20-28 μm. Long colpi with thickened margins. Tectate, psilate to slightly granular surface. Exine 1.5-2 μm thick.
Did you know?
Sorrel leaves have an acidic taste from oxalic acid and are used in salads and soups. In excess, they can be toxic due to oxalate accumulation.
The information on this page is for educational purposes. For any questions about allergies, consult your doctor or allergist.