Unknown plant

Photo Description

I have no idea what this plant is, but it had, presumably, recently fired out a load of seeds.

If anyone has an idea what this might be please let me know in the comments.

Photo Data

Date Taken 15 Feb 2012, 15:02:35
Camera Canon EOS 550D
Focal Length 17mm
Aperture f/2.8
ISO 200
Shutter Speed 1/500 second