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Carex is a vast genus of over 2,000 species [2] of grass-like plants in the family Cyperaceae, commonly known as sedges (or seg, in older books).Other members of the family Cyperaceae 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.
It is 30–90 centimetres (12–35 in) high with the leaves being strongly keeled, Y-shaped and are 3–5 millimetres (0.12–0.20 in) wide. [1] The species culms are erect, smooth on the bottom and scabrous above. They are 40–80 centimetres (16–31 in) in length and are circa 1.3 millimetres (0.051 in) in diameter.
Carex praecox, the spring sedge, is a species of flowering plant in the genus Carex, native to Europe, western Asia, and Mongolia. [ 2 ] [ 3 ] Its diploid chromosome number is 2n=58, with some uncertainty.
Carex rupestris, called the curly sedge and rock sedge (names it shares with other members of its genus), is a species of flowering plant in the family Cyperaceae, native to temperate and subarctic North America, Greenland, Iceland, Europe, and Asia.
It has smooth, erect, cylindrically tapering culms that are typically 5 to 20 cm (2.0 to 7.9 in) in length but can reach 30 cm (12 in) long and are 0.5 to 1.2 mm (0.020 to 0.047 in) in diameter. The leaves are often shorter than the culms and have a width of 0.2–1.2 mm (0.0079–0.0472 in) and have yellow to brown coloured sheaths.
Carex firma forms thick cushions. Its leaves are up to 8 centimetres (3.1 in) long in normal conditions (up to 10 cm or 4 in in moist, sheltered localities), dark green and stiff. [ 1 ] The stems are up to 20 cm (7.9 in) tall (exceptionally 30 cm or 12 in), but always at least twice as long as the leaves.
Carex bicolor is a tufted perennial sedge growing to a height of about 7 to 12 cm (3 to 5 in). The grass-like leaves are mostly basal, greyish-green with blades up to 60 mm (2.4 in) long and 1 mm (0.04 in) wide, linear, strongly keeled, with parallel veins and long pointed tips.