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 woods, waysides, and hedges, and it is a casual escape from gardens in many instances. The habit is erect. The stem is smooth or downy, simple, with numerous leaves, nearly round, the radical leaves heart-shaped, on long stalks, rough, unequally scalloped and coarsely toothed, the upper stem-leaves are stalk-less and lance-shaped. The flowers are pale blue, bell-shaped, in terminal racemes, turned one way, bent back, the calyx segments drooping at length, and the corolla lobes bent back. The capsule is nearly round, the valves at the base. The plant is 1-2 ft. in height. It flowers in July and August. It is a herbaceous perennial.
The habitat of this plant is moist woods and turfy places, bogs and damp places, damp peaty places in the S. and W. The habit is prostrate. The stem is graceful, branched, slender, the rootstock creeping, the whole plant hairless. The leaves are membranous, alternate, stalked, heart-shaped or rounded, more or less acutely 5-lobed, or angled, ivy-shaped (hence hederacea), the upper sometimes opposite, the flower-stalk slender. The flowers are pale-blue, with dark veins, bell-shaped, nodding then erect, narrow, the corolla cylindric, with short, blunt lobes, bent back. The calyx-tube is shortly conical, with triangular to awl-shaped erect lobes. The flower-stalks are longer than the leaf-stalks and leaves, solitary. The fruit is nearly round, and is a membranous capsule opening within the calyx-lobes. The plant is creeping, and flowers in July and August, being a herbaceous perennial.