Any of several sedges (genus Carex), which grow in rocky habitats; especially C. rupestris, native to northern Europe and northern and central parts of the United States.
Origin
Mid 19th century.
Definition of rock sedge in US English:
rock sedge
noun
Any of several sedges (genus Carex), which grow in rocky habitats; especially C. rupestris, native to northern Europe and northern and central parts of the United States.