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P. coronarius argenteo-variegatus has silvery-tinted leaves; P. coronarius flore-pleno, full double flowers; and P. coronarius Keteleeri flore-pleno is the best double-flowered form in cultivation.
The variety V. minor flore-albo has white flowers, those of the normal plant being pale blue; V. minor flore-pleno differs in having double blue flowers; V. minor foliis aureis has golden-tinted leaves; and V. minor foliis argenteis bears silvery mottled and very attractive foliage.
There is a charming double-flowered variety named G. hispanica flore-pleno. G. LUSITANICA. Portugal, 1771. This is remarkable for its opposite branches, is of spiny growth, and one of the earliest to appear in flower. G. MONOSPERMA. South Europe, 1690. This has white flowers, and is of value as a seaside shrub, and grows well in almost pure sand. A native of the Mediterranean coast.
The flowers are few but pretty, and with the dwarf habit render the plant an excellent subject for rockwork. G. TINCTORIA. Dyers' Greenweed. This is a spineless species, and bears a profusion of yellow flowers from July onwards. The double-flowering variety, G. tinctoria flore-pleno, is, in so far as ornamental qualities are concerned, superior to the parent form.
A Japanese shrub, the double-flowered variety of which, K. japonica flore-pleno, is one of our commonest wall plants. The orange-yellow flowers, produced in great rosettes, are highly ornamental, and have earned for the shrub a well-known name. It succeeds well almost anywhere, and, though usually seen as a wall plant, is perfectly hardy, and forms a neat shrub for the open border.
W. chinensis alba has pretty white flowers; W. chinensis flore-pleno has not proved very satisfactory, but when seen at its best, which is, however, but rarely, the double flowers are both beautiful and showy; W. chinensis variegata has badly variegated foliage; and W. chinensis macrobotrys is a plant of great beauty with very long racemes of pale lavender flowers, but they vary a good deal in colour, those of some plants being almost white.
The double-flowered form, D. crenata flore-pleno, is one of the prettiest flowering shrubs in cultivation, the wealth of double flowers, not white as in the species, but tinged with reddish-purple being highly attractive. D. crenata, Pride of Rochester, is another form with double-white flowers, and a most distinct and beautiful shrub.
It forms an upright, branching bush usually about 3 ft. high, and is best known under the name of S. confusa. S. PRUNIFOLIA. China and Japan, 1845. A twiggy-branched shrub growing 4 feet or 5 feet high, with oval, Plum-like leaves, and white flowers. There is a double-flowering variety named S. prunifolia flore-pleno, which is both distinct and beautiful. S. ROTUNDIFOLIA. Round-leaved Spiraea.
An indigenous, spiny shrub, with tiny white flowers; and P. spinosa flore-pleno has small, rosette-like flowers that are both showy and effective. P. TOMENTOSA. Japan, 1872. This is one of the most desirable of hardy shrubs, with large, white, flesh-tinted flowers produced in the first weeks of March, and in such quantities as almost to hide the branches from view.
A Chinese Plum of somewhat slender growth, and with the branches wreathed in small, white flowers. It is often seen as a pot plant, but it is one of the hardiest of its family. P. sinensis flore-pleno is a double white form, and the most ornamental for pot work. There is also a variety with rose-coloured flowers. P. SPINOSA. Sloe, or Blackthorn.
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