Another new plant for me from the weekend's SBRS jaunt around Landport and Offham marshes. This striking tall blue-green grass is Sea Couch or Elytrigia atherica. It was growing along the bank of the Ouse, striking sculptural poses in small tufts, towering above the other grasses. Hard to ignore.
Looking at the top right photo you might be thinking "Lolium" or "rye grass" (according to your level of botanical initiation), but a glance at the top left photo reveals that the spikelets are arranged parallel to the inflorescence and not at right angles as is the case with rye grasses. (I see now that I'll have to find a rye grass to blog tomorrow!)