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Medium to tall plant, stem hollow, deeply ridged. Lower leaves pinnate with 3 to 9 toothed or leaflets with the end leaflet being three-lobed (usually). Stem leaves smaller and with prominent inflated bases. Flowers white, sometimes pink 3mm in flat topped umbels 3 to 6 cm across with 10 to 15 rays.
Roadside verges, rough grassland, hedgebanks and woodland margins.
June to August.
In Britain it is only frequent in south-eastern, central and northern England and in the South-west of Ireland.
It is quite frequent in Leicestershire and Rutland. In the 1979 Flora survey of Leicestershire it was found in 241 of the 617 tetrads.
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