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.
Root-stock creeping. Leaves oblong-lanceolate, long, narrowed gradually from below. Flowers nearly circular, bluish-white or pale-blue. Spur green. 6-12 in. April-June. Herbaceous perennial. Fens, Hunts.
Creeping. Leaves oblong; margins flat. Flowers red, lateral. Fruit large, globular. July. Perennial shrub. Flintshire bogs.
Erect. Stem round in section. Leaves septate, hollow, round in section. Flowers in a spreading cyme with zigzag branches. Perianth-segments blunt, pale, as long as the narrow-pointed capsule. 1-3 ft. July. Herbaceous perennial.
Tufted. Stems grooved. Spikelets 1-3, lateral, slender, nearly equalling the erect sheathing bracts. 4-8 in. June. Herbaceous perennial. Perthshire bogs.
Soboles far-reaching. Stems erect, equalling leaves. Spike nearly unisexual. Spikelets in an oblong interrupted spike, in two rows. Upper and lower fertile, intermediate barren. Fruit ovoid-lanceolate, with narrow wing, longer than glumes. 1-2 ft. June. Herbaceous perennial.