Cyperaceae: Sedge Family — Tule, Bulrushes et al
“Reeds and rushes are round but sedges have edges”. There is some truth in this popular saying but it is not invariably the case. It does however explain why Bulrushes have triangular, sometimes sharp-edged stems; this is because they are sedges (Cyperaceae) not reeds or rushes (Juncaceae). Not all reeds or rushes have round stems or leaves, some have flattened stems and more than a few have flattened leaves.