Alex Hyde / Common buckthorn (Rhamnus cathartica) leaves and berries, Strumpshaw Fen, Norfolk, UK, September.

Alex Hyde / Leaves and fruits of Common buckthorn (Rhamnus cathartica) Cambridgeshire, UK. September.

Simon Colmer / Purging Buckthorn berries (Rhamnus cathartica) Levin Down NR, Sussex, UK

Simon Colmer / Purging Buckthorn berries (Rhamnus cathartica) Levin Down NR, Sussex, UK

Mike Read / Buckthorn (Rhamnus catharticus) berries, Radipole Lane RSPB Reserve, Weymouth, Dorset, England, UK. September.

Nick Upton / Common / Purging buckthorn (Rhamnus cathartica) berry clusters ripening in a roadside hedgerow, Wiltshire, UK, September.

Nigel Cattlin / Leaves and berries of common or purging buckthorn (Rhamnus cathartica) in late summer, Berkshire, England, UK, August