Carex

Carex is a huge genus of more than 2,000 species of sedge. 
They are grass-like plants in the family Cyperaceae, commonly known as sedges. Other members of the family Cyperaceae are also called sedges, but those of genus "Carex" may be called true sedges. "Carex" has most species in the family.
All species of "Carex" are perennial.