What is "prickwillow"

Originally a small hamlet on the banks of the River Great Ouse, but now on the banks of the River Lark since re-organisation of the river system, the village of Prickwillow has an estimated mid-2005 population of 440. It lies in the south of the Fens, east of the city of Ely (where the population is included) in Cambridgeshire, England, and is home to Prickwillow Museum, which tells the story of the changing face of Fenland. Prickwillow Museum is housed in the old pumping station and contains a major collection of working pumping engines. The village is also home to the Ely Group of Internal Drainage Boards.