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 bogs. The plant has the sedge habit. The rootstock is tufted, shortly stoloniferous. The stems are smooth, rigid, round in section, grooved. The leaves are bristle-like, slender, erect, longer than the stem, with the margin inrolled. The spike is barren above, the spikelets without bracts. There are 6-12 glumes, the lower distant, egg-shaped to oblong, acute, half as long as the fruit. The fruit is bent-back, egg-shaped, lance-shaped, stalked, triangular, flea-like (hence pulicaris), flattened, beaked, pale. The racheola or rudimentary rachis at the base of the ovary is linear, sometimes bearing flowers. The nut is oblong, plano-convex, grey or dark brown. The plant is 3-8 in. long, and flowers between May and July. It is a herbaceous perennial.
The habitat of this sedge is Scotch spongy bogs. The plant has the sedge habit. The stems are smooth, erect, branched, and have short, sheathing leaves at the base, and are longer than the leaves. The spikelets are crowded in a small, shortly egg-shaped head. The bracts are long-pointed, membranous, the lower equalling the spike. The glumes are blunt, with a membranous margin. The fruit is inflated, egg-shaped, brown, shining, with dark-brown veins, narrowed suddenly to a small beak, divided into 2 nearly to the base. The nut is round. The plant is 6-12 in. high, and flowers in July and August, being a herbaceous perennial.
Carexteretiuscula, Good.( = C. diandra, Schrank). The habitat of this species is bogs and meadows, boggy meadows. The plant has the sedge habit. The rootstock is obliquely creeping, forming scattered tufts. The stems are wiry, slender, 3-angled, with convex sides, rough above. The spike is dense, broad, compound, oblong. The spikelets are few. The fruit is egg-shaped, brown, shining, spreading, swollen, few-nerved, longer than the egg-shaped, long, narrow-pointed glumes, ribbed on the back, with 2-4 central ribs spreading from the base, and meeting under the beak. The beak is winged. The nut is inversely pear-shaped, biconvex. The plant is 9-18 in. high, flowering between June and August, and is a herbaceous perennial.
The habitat of this plant is marshes and bogs. The plant has the sedge habit. The rootstock is densely tufted, crowned with the fibrous remains or black, erect nerves of old sheaths, the decayed leaves. The stems are slender, 3-angled, rough above with convex sides. The panicles are narrow, small, long and loose, spicate, with lower distinct branches. The fruit is egg-shaped, swollen, the beak narrow, split to the base, with overlapping margins, with numerous short, raised ribs near the base. The nut is rhomboidal, narrowed below, doubly convex, with a short beak, which is not winged. The style is somewhat enlarged at the base. The plant is 9-18 in. high, flowering in June and July, and is a herbaceous perennial.