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 the margins of ponds, muddy places where water has lain. The habit is the rosette habit. The rootstock is slender, creeping, rooting. The plant is very small. There is no stem, except the underground or creeping stolons. The leaves are narrow, oblong to lance-shaped, or spoon-shaped, tufted, long-stalked. The flowers are small, white, or rose-coloured, on axillary stalks, not so long as the leaves, or leaf-stalks, bent back in fruit. The capsule is ovoid and very small. The plant is 1-4 in. in height, flowering between July and September, and is a herbaceous annual.
The habitat of this plant is watery places. The plant is prostrate then ascending in habit. The plant is stoloniferous, devoid of hairs, erect, stout, hollow, succulent. The stem is simple or bears a few branches. The leaves are stalkless, half-clasping, ovate, oblong to lance-shaped, coarsely toothed, with small teeth, and auricled. The flowers are pale-blue, in slender, sometimes glandular, ascending, opposite racemes, which lengthen in fruit. There are lance-shaped bracts, as long as the ultimate flower-stalks. The sepals are ovate to lance-shaped, more or less acute, smooth or glandular. The fruit-stalks are spreading. The capsule is elliptical, oval, notched, turgid, not so long as the sepals. There is a medium-sized style. The seeds are small, biconvex. The plant is 1-3 ft. high, flowering in July and August, and is a herbaceous perennial.