Burnet-saxifrage - Pimpinella saxifraga

A medium plant, stem scarcely ridged, hollow but tough. Flowers white, occasionally with a pinkish tinge 2 mm, borne in umbels without bracts or bracteoles.  It is usually downy, but can be glabrous, and the basal leaves are very variable - sometimes finely divided into lobes and sometimes with oval toothed lobes. 

Some glabrous specimens with divided leaves can look a bit like Pignut

A grassland species, very variable.  No bracts or bracteoles, fruits rounded and glabrous.

A side-on photo of the plant in its habitat, showing umbels and basal leaves

Grassland, rocky places, roadsides and railway verges, often on calcareous soils.

July and August.

Perennial.

Widespread and fairly frequent in Britain.

Locally frequent in Leicestershire and Rutland. In the 1979 Flora survey of Leicestershire it was found in 198 of the 617 tetrads.

In the current Checklist (Jeeves, 2011) it is listed as native; occasional, but locally frequent where it occurs