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.
The typical C. lanuginosa is a native of China, whence it was introduced in 1851. It flowers from June to October, and has given rise to-such fine broad-petal led varieties as alba magna, white; Beauty of Worcester, double, bluish violet (fig. 422); Anderson Henry i, creamy white; Excelsior, deep mauve; Fairy Queen, pale flesh with pink bar; Lady Caroline Neville, delicate bluish white with mauve bars; La France, deep violet purple; Lord Neville, deep plum colour, crimped; Marie Van Howtte, white, suffused with mauve; Jmperatrice Eugenie, pure white; Mrs. Bush, pale lavender; Princess of Wales, bluish mauve; Queen Alexandra, pale lavender to white; William Kennett, deep lavender, etc.
Fig. 421. - Clematis Madame Edouard Andre.
Fig. 422. - Clematis Beauty of Worcester.
The typical C. patens is a native of Japan, with three to five leaflets, and flowers from May to July, the blooms being 5-6 in. across and with six to eight delicate mauve sepals. Amongst the best garden forms are Albert Victor, deep lavender, pale bar; Duke of Edinburgh, violet purple; President, purple claret; Edouard Defosse, deep mauve; Fair Rosamund, blush white barred with red; Lady Londes-borough, bluish lilac with pale purple bar; Miss Bateman, white; Marcel Moser, French white with pink bar; Mrs. George Jackman, white with creamy bar; Sir Garnet Wolseley, pale blue barred with plum red; The Queen, violet.
C. florida is also a Japanese plant and has creamy white flowers with six to eight sepals, borne from April to September on the wood of the previous season. Garden forms are Belle of Woking, silver grey, double; Countess of Lovelace, bright bluish lilac; Duchess of Edinburgh, pure white; Fortunei, white, double; John Gould Veitch, pale blue or lavender; Lucie Lemoine, white, double; Venus Victory, pale lavender, double.
C. Viticella is a native of southern Europe and western Asia, and has drooping blue, purple, or rosy flowers about 2 in. across, borne on the current year's shoots from July to October. The plants require to be pruned severely in the same way as the Jackmanni section. Garden forms are Lady Bovill, greyish blue, cup shaped; Madame Grange, crimson violet, shaded red in the centre; Mrs, James Bateman, pale lavender; rubra grandiflora, bright claret red; Thomas Moore, bright magenta; Kermesina, bright red; Ascotensis, azure blue; Ville de Lyon, bright carmine red.
Other Clematises grown are C. coccinea, an American species with tubular or top-shaped scarlet or crimson flowers reflexed at the tips. It has been crossed with other varieties, and some of the best forms at present are Countess of Onslow, violet purple, banded with red; Duchess of Albany, bright pink and lilac; Duchess of York, bluish pink.
All the above grow freely in the open air, and are extensively used for covering arches, trellises, poles, pergolas, etc. There are several other hardy Clematises, natural species, to be met with chiefly in botanical collections, and of no great commercial value or beauty. Amongst them are alpina (also known as Atragene), with ten to twelve blue or white segments, in May and June; cozrulea, violet, June and July; flammula, creamy white; heraclecefolia, purplish blue Hyacinth-like flowers, which in the variety Davidiana are a bright lavender blue, and in the variety Hookeri lilac; montana, a well-known climber with very long stems, and pure-white cross-shaped flowers in April and May; the variety rubens has soft rose-red flowers; orientalis (or graveolens), greenish yellow, scented, August and September; recta, rather bushy habit, with sweetly scented white flowers from June to August; Viorna, dull-reddish purple, balloon shaped, etc.
Special mention should be made of C. indivisa, a charming New Zealand species, with pure-white starry flowers about 3 in. across, borne from February to March and April. It is best grown in a greenhouse, and can only be considered hardy in the very mildest parts of the kingdom.