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 fields, waste places, and cultivated land. The habit is trailing or creeping, twining. The root is fibrous. The stem is angular, downy on the angles, the leaves heart-shaped, arrow-shaped, the leaf-stalk short, slender. The flower-stalks are bent back, jointed above the middle. The flowers are in a raceme, the perianth segments bluntly keeled, the sepals green, blunt, with white margins. The nut is 3-angled, opaque, finely furrowed. The plant is 1-4 ft. in height, and flowers in July up till September, being a herbaceous annual.