Which characteristic distinguishes sedges from regular grasses?

Sedges are distinguished from regular grasses primarily due to their stems, which are unjointed and have a triangular cross-section. This structural characteristic is a key identifier, as grasses typically possess round, jointed stems. Understanding this distinction is important in aquatic management and habitat assessments, as it helps in correctly identifying plant species in or around water bodies.

While sedges can sometimes have evergreen qualities, this is not a defining characteristic, as there are many grasses that can also retain green foliage into the winter. Similarly, the blooming period and stem hollowness do not offer reliable differentiation. Hence, the unique triangular shape of sedges is the critical feature that sets them apart from regular grasses.