Grassland sedge exhibits fine-textured, bright green leaves that are strikingly narrow, measuring approximately 1/8 inch (3.2 mm) in width. The leaves are grass-like, long, and slender with a smooth, yet firm texture. They are primarily linear in shape, tapering slightly toward the tip. The veins are parallel and prominent, contributing to the structured appearance. This fine linearity, combined with their vibrant green hue, makes the leaves a notable feature of grassland sedge.

The flowers of grassland sedge are small and inconspicuous, appearing in late spring. They are bronze-colored and typically form slender spikes. Each spike can measure up to 2 inches (5 cm) in length. The flowers lack noticeable petals and are not known for any particular scent. They are arranged along the spike in a manner that is more functional than decorative, playing a crucial role in the plant’s reproductive cycle.

The stem of grassland sedge is distinctly triangular in cross-section, providing a unique feature for identification. It possesses a smooth texture and a coloration ranging from light green to pale yellow. The stems typically stand erect, reaching heights of up to 3 feet (90 cm) and exhibit a diametric thickness of around 0.1 inches (2.5 mm). Lacking prominent branching, the stems often form dense clusters. The stem is robust yet flexible, supporting the plant's overall structure with resilience.

The fruit of grassland sedge consists of small, rounded seed clusters that are dark brown in color. Each cluster presents a textured surface enveloping the seeds, which are encased in a sac-like structure known as a perigynium. Typically, these fruiting bodies emerge in tight, globular formations, which can span approximately 0.2 to 0.3 inches (5 to 8 mm) in diameter. The seeds within are diminutive, with a hard exterior that aids in their dispersal. This fruit characteristic is a distinguishing feature that assists in the identification of grassland sedge.