Triglochin maritima L.
The common name of this plant comes from the grass-like leaves at it's base. Miniscule greenish- to pink-white flowers grow in rings around the stalk giving it a braided appearance. Fruit pods are in tight clusters.
Leaves of this plant are toxic, especially to ruminants. Touching this plant produces a burning sensation followed by sore numbness for a couple of hours. Use gloves if you have to handle it.
Shallow marshes, roadside ditches, wet-moist areas.