This section is from the book "British Wild Flowers - In Their Natural Haunts Vol5-6", by A. R. Horwood. Also available from Amazon: A British Wild Flowers In Their Natural Haunts.
The habitat of this plant is alpine bogs, boggy wet places on mountains. The plant has the rush habit. There are no stolons. The stems are tufted, black, round in section, slender, wiry, leafless. The radical leaves are awl-like, channelled, short, made up of two separate tubes. The sheaths are auricled. The leaflike bract is membranous, as long as, or shorter than, the flowers. The flowers are 2, or 3 (hence triglumis), terminal, erect, pale-brown in fruit. The perianth-segments are blunt, not so long as the capsule, elliptic to oblong. The capsule is egg-shaped to oblong, beaked, chestnut. The plant is 3-9 in. high, flowering in July and August, and is a herbaceous perennial.
The habitat of this plant is wet places, boggy spots on mountains, and bogs. The plant has the rush habit. The root is fibrous. The stems are stoloniferous. The plant is not tufted. The stems are half-round in section, leafless, channelled one side, seldom more than one from each root. The leaves are radical, awl-like, flattened at the margin, not channelled, or made up of 2 tubes, septate within. The sheaths are not auricled. The flowers are usually 2 (hence biglumis), not as long as the bract, arranged one side, the upper stalked, not so long as the bract, the lower stalkless, chestnut-brown. The perianth-segments are blunt, as long as the capsule, or nearly so. The capsule is blunt-pointed between the lobes, notched, 3-lobed, conical, 3-angled, light-brown, with pale margins. The plant is 2-6 in. high, flowering in July and August, and is a herbaceous perennial.
The habitat of this plant is Scotch mountains, alpine bogs, micaceous mountain bogs at great elevations. The Chestnut Rush has the rush habit. The plant is not tufted and stoloniferous. The rootstock has loose stolons. The stems are round in section, leafy. The leaves are channelled, 2, half-round in section, hollow. The sheaths are not auricled, having thin walls. The flowers are bright-brown, in 2-3 cymes or solitary, lateral and terminal, 2-6 flowered. The leaflike bracts are longer than the flowers. The perianth-segments are acute, half as long as the capsule, elliptic to lance - shaped. The capsule is dark-brown, 3-angled, beaked, egg-shaped, oblong, pointed. The seeds are large. The plant is 4-16 in. high, flowering in July and August, and is a herbaceous perennial.
The habitat of this rush is marshy places, damp places. The Small Marsh Rush has the rush habit. The plant is slender, with a creeping rootstock. The stems are tufted, slender, hollow, half-flattened at the margin with 1 leaf in the middle, or 1-2, erect, leafy below, more or less naked above. The leaves are linear, channelled above, slender, half-round in section, narrow, limp, more or less erect, as long as the stem, or shorter. The flowers are more or less solitary, in terminal, compound, compact, cymose panicles, not so long as the small pale bracts, with more or less erect branches, slender, and with few flowers. The perianth-segments are oval, oblong, blunt, as long as, or shorter than the capsule, pale in the middle, the margins broad, membranous, pale or dark-brown or purple. The anthers are oblong, and the style is half as long as the ovary. The capsule is roundly inversely egg-shaped, bluntly and shortly pointed. The plant is 12-20 in. high, flowering from June to August, and is a herbaceous perennial.