Riverside plant

Riverside plant

Observation - Riverside plant. Description: Seen along on the bank of the river Stour in Dorset. Unfortunately on the far bank so I could not see if the plant was actually growing in the water or on the bank. As it was some way off this is not the best photograph but that flowerhead looks quite uni

Seen along on the bank of the river Stour in Dorset. Unfortunately on the far bank so I could not see if the plant was actually growing in the water or on the bank. As it was some way off this is not the best photograph but that flowerhead looks quite unique to me so hopefully it can be identified.