Just by the side of the Chemin des Tumuli between St. Hubert and Bonniers, there is this luxuriant Wood Sedge (Laîche des bois, Boszegge), 𝐶𝑎𝑟𝑒𝑥 𝑠𝑦𝑙𝑣𝑎𝑡𝑖𝑐𝑎.
This specimen may well be over ten years old and, being semi-evergreen, offers winter shelter for the smaller creatures.
The English word sedge comes from an old Germanic root meaning "cutting", a reference to the often sharp-edged leaves. The old rhyme still helps:
“Sedges have edges,
Rushes are round,
Grasses have knees
That bend to the ground.”
'Knees' refers to the nodes.