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 marshes. The plant has the Iris habit. The stem is round. The leaves are linear. The flowers vary in colour. The lamina is externally yellowish, white-veined, with a blue claw, furrowed, the inner segments and stigma violet. The capsule is blunt-pointed. The plant is 2-3 ft. high, flowering in June and July, and is a herbaceous perennial.
The habitat of this species is damp, grassy places and bogs. The plant has the grass habit. The leaves are radical, grass-like, sword-shaped. The flowers are blue, in an umbel, on a 2-edged scape (with a flat, narrow wing) which is more or less simple and leafless. The spathe is 1-6-flowered, with equal lance-shaped valves, not so long as the flowers. The perianth-segments are blue inside, oblong, bluntly notched, erect, lance-shaped. The capsule is rounded, 3-angled. The plant is 6-12 in. high, flowering in July and August, and is a herbaceous perennial.
The habitat of this species is marshes. The plant has the grass habit. The leaves are radical. The flowers are borne on simple, flattened scapes broadly winged and leafless, usually 2. The spathe is erect, the outer valve equalling the flower, sheathing, united at the base. The perianth is yellow, turning orange, with dark veins, and the segments are oval, narrow below. The capsule is ellipsoid, 3-angled. The plant is 6-18 in. high, flowering between July and September, and is a herbaceous perennial.
This plant is often cultivated, and has been found in old gardens, orchards, hedgebanks. The habit is the flag habit. The root is tuberous. The leaves are tetragonal. The plant is i-flowered, the flowers bluish-brown. The perianth segments are acute, velvety, purple. The plant is 1-2 ft. high, flowering in June and July, and is a herbaceous perennial.