The
monoecious and
rhizomatous perennial grass-like sedge has a tufted habit and typically grows to a height of . It blooms between September and October or November producing brown flowers. It has green coloured leaf blades that are typically about long on young plants, over time the blades become a dark yellow-brown colour that form a sheath about the cylindrical flower stems. The flowers are made up of small brown
bracts that are clustered quite densely toward the terminus of the erect, green and hollow flowering stems. The dark brown fruits that form after flowering are an oval-shaped nut type seed that is only a few millimetres in diameter. The
utricle of
C. tereticaulis closely resembles that of
Carex appressa. ==Taxonomy==