This section is from the book "Commercial Gardening Vol4", by John Weathers (the Editor). Also available from Amazon: Commercial Gardening, A Practical & Scientific Treatise For Market Gardeners.
There are two hardy shrubs in this genus worth noting, viz. C. fostidum (Bungei), a Chinese plant, 5 ft. high, with large downy heart-shaped leaves and dense clusters of lilac-rose flowers in August, remarkable for the very disagreeable odour of the leaves when bruised; and C. trichotomum, from Japan, 6-20 ft. high, with ovate serrate leaves and white sweet-scented flowers with reddish or purple inflated calices. These plants require warm and sheltered situations, and may be increased from seeds, cuttings, layers, and root cuttings.
A genus of shrubby or twining plants of free growth and ornamental appearance when in blossom. They like a loamy soil and stove treatment, and may be raised from cuttings. The best kinds are: C. fallax, a bushy plant with large spreading leaves and large trusses of bright-scarlet flowers. C. fragrans has white flowers tinted with red. C. Thomsonoe (or Balfouri), with twining stems, is a fine species with a profusion of deep-red flowers and pure-white calyces. C. splendens has rich-crimson flowers, and C. speciosum is a hybrid between it and C. Thomsonoe.