Knobby Club-rush is an upright, perennial sedge to a little over a metre in height. It has a clumping habit from which rhizomes continue to spread out. Along our coast it is chiefly found where sand dunes occur such as Point Impossible where it can form large drifts, especially where extra moisture persists.
Leaves are reduced to brownish sheaths at the base of the plant but are often well hidden by incremental sand build-up; whilst the long lime green cylindrical stems (culms) support the flower head.
Flowers are distinctly globular near the apex of the culm with a short floral bract extending past the flowerhead and terminating in a sharp point.

Very adaptable plant used regularly in landscaping for its widespread association with the beach. Useful also in arresting beach sand erosion.

Indigenous uses as provided by the Wathaurung Aboriginal Corporation: The pith and rhizome of this plant is edible. And the long trailing rhizome/roots are used to make headbands.