What the Heck are these?

There is a small population (twenty/thirty or so Plants) growing on the Thames' Foreshore, close to the Erith Docks. We just cannot remember what they look like:

Something to keep an eye on.

Plants we hope/expect to see on the Thames' Foreshore locally include:

(Common) Cord Grass
English Scurvy-Grass
Hemlock Water-Dropwort
Lesser Sea-Spurry
Marsh Woundwort
Sea Arrowgrass
Sea Aster
Sea Beet
Sea Couch
Sea Club-Rush
Sea Milkwort
Sea Plantain
and Sea Purslane

Plus of course: the Seaweeds.