Carex (wetland) (named varieties)

Carex is a vast genus of more than 2,000 species^[2] of grassy plants in the family Cyperaceae, commonly known as sedges (or seg, in older books). Other members of the Cyperaceae family are also called sedges, however those of genus Carex may be called true sedges, and it is the most species-rich genus in the family.

Carex species and cultivars are popular in horticulture, particularly in shady positions.^[12][13] Native species are used in wildland habitat restoration projects, natural landscaping, and in sustainable landscaping as drought-tolerant grass replacements for lawns and garden meadows.^[14] Some require damp or wet conditions, others are relatively drought-tolerant. 

Source: Wikipedia