A pepperwort of some kind?

A pepperwort of some kind?

Observation - A pepperwort of some kind? - UK and Ireland. Description: Lots of this was growing just behind the shingle beach at Cuckmere Haven on the Sussex coast. I thou

Lots of this was growing just behind the shingle beach at Cuckmere Haven on the Sussex coast. I thought I knew most coastal shingle plants, but have never seen this before