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 species is spongy bogs. The plant has the sedge habit. The plant is creeping, with a slender rootstock. The stems are slender, 3-sided. The leaves are narrow, bluish-green, linear, channelled, rough at the margin, bent-back. The bracts are auricled, short, and slender, strongly-keeled, scarcely sheathing. The fertile spikelets are 1-2, drooping, short, long-stalked, egg-shaped, cylindrical or oblong, dense-flowered, a few male at the top, as long as the stalk, which is slender. The male spikelets are erect, slender, with some female above. The glumes are broad, blunt-pointed, pale, few, large, loose, egg-shaped, with a green midrib, ribbed, with brown margins. The fruit is more or less 3-angled, blunt-pointed, bluish-green, as long as the glume, flattened, round, ellipsoid, ribbed, the beak short and entire. The nut is oval, inversely egg-shaped, 3-angled, beaked, pale. The plant is 6-15 in. high, flowering in June and July, and is a herbaceous perennial.
The habitat of this plant is alpine bogs, wet places, on Scotch mountains, elevated bogs in the Highlands. The plant has the sedge habit. The rootstock is creeping. The stems are wiry, 3-angled, smooth, leafy below. The leaves are erect, narrow, flat, rough at the edge near the apex. The bracts are short, with very short sheaths. The fertile spikelets are as long as the long, hairlike, ultimate flower-stalks, 2-3, drooping, few-flowered, oblong, loose. The male spike-let (1) is short, nearly erect. The glumes are broad, pale-brown, membranous, blunt, shining, folded round the fruit, dark-brown, with a pale midrib, apiculate, as long as the fruit. The fruit is stalked, oblong, elliptic to inversely egg-shaped, shorter than the glume, with a narrow point, 3-angled, green or brown, smooth, faintly-nerved, the beak very short, entire. The nut is brown, oblong, 3-angled, dotted, round to oblong. The plant is 4-12 in., flowering between June and August, and is a herbaceous perennial.
The habitat of this plant is bogs and marshes, peat bogs. The plant has the sedge habit and is slender. The rootstock is creeping, and the plant is stoloniferous. The stem is somewhat rough above, 3-angled, leafy. The leaves are very long, numerous, very slender (hence Jiliformis), stiff, short, channelled, the margin inrolled, with a filamentous, bordered sheath below, red-brown, stout, the 2-3 lower very long, without a blade. The bracts are leaflike, the lowermost sheathing. The fertile spikelets, 3-4, are oblong, blunt, stalkless, distant, loose, erect, the lower bracts thread-like, longer than the stem. The male spikelets are 2-3, brown, very slender. The glumes are lance - shaped, narrow-pointed, chestnut-brown, the margin the same colour, the midrib green, that of the male florets narrower and more membranous. The fruit is plano-convex, narrow to egg-shaped, swollen, downy, as long as the glumes, green, narrowed to a blunt beak, divided into 2 nearly to the base. The nut is narrowly elliptic, 3-angled, stalked. The plant is 2-3 ft. high, flowering in May and June, and is a herbaceous perennial.