Hi,

I have a weed growing in my field in abundance. The field is grassed and this weed grows in the wetter areas but is spreading. It is almost like a solanum type leaf and has very ditinctive brown/black markings as per the lower leaves in the picture attached, the east/west facing leaves. Every old leaf has the markings, new ones don't initially. It is just coming into flower now 21st August in Lincolnshire and looks like a climber. The flower is small and pink. Can anyone help identify it please as it is taking over in huge swathes.
Thanks
Paul