These several families of roses, resulting from the development of the several species of wild rose, have mingled together; in other words, they have intermarried: for Linnaeus has shown that "the loves of the flowers" are more than a conceit of poetical fancy. From the fertilization of the flowers of a rose of one family with the pollen of a rose of another family arises a mixed offspring, called hybrids: Seeds—which are vegetable eggs—are first produced; and these seeds germinate, or hatch, into a brood of young plants, combining in some degree the qualities of their parents. As this process of intermixture may be carried on indefinitely, a vast number of new varieties has resulted from it.
The botanical classification of the rose is a perplexity to botanists. Its garden classification—quite another matter—is no less a source of embarrassment to its amateur, not to say professional, cultivator. To many, indeed, its entire nomenclature is a labyrinth of confusion; and some have gone to the length of proposing to abolish distinctions, which, in their eyes, seem arbitrary or fanciful. These distinctions, however, are founded in Nature, though the superstructure built upon her is sometimes flimsy enough to justify the impatience of its assailants. The chief difficulty arises from the extent to which the hybridization of the rose has been carried, and the vast entanglement of combinations which has resulted. Out of a propensity to classify, where, in the nature of things, precise classification is impossible, has arisen the equivocal and shadowy character of many of the nominal distinctions.
Omitting less important divisions, the following are the groups into which cultivated roses are ordinarily divided: The Provence,* the Moss,* the French,* the Hybrid China, the Damask,* the Alba,* the Austrian Brier,* the Sweet-brier,* the Scotch,* the Double Yellow,* the Ayrshire,* the Sempervirens,* the Multiflora,* the Boursault,* the Banksia,* the Prairie.* These bloom once in the season. The following are perpetual or remontant: The China,* the Tea,* the Bourbon, the Hybrid Perpetual, the Perpetual Moss, the Damask Perpetual,* the Noisette, the Musk,* the Macartney,* the Microphylla.*
Some of the above are marked with a star*: these are roses of pure blood. The rest are roses of mixed or hybrid origin. By the former are meant those which have sprung, without intermixture, from the wild roses which grew naturally in various parts of the world, and which are the only roses of which the botanical classifier takes cognizance. Many of them are of great beauty, and would be highly prized for ornamental uses, were they not eclipsed by the more splendid double varieties, which the industry of the florist has developed from them. Each of these groups of unmixed roses, however modified in form, size, or color, retains, as already mentioned, distinctive features of the native type from which it sprang. Yet it often happens that the name is misapplied. Thus a rose called Damask is not always a Damask, but a hybrid between a Damask and some other variety. The true distinctive features of the group are thus rendered, in some nominal members of it, so faint, that they can scarcely be recognized. Leaving these bastards out of view, we will consider at present only the legitimate offspring of the various families of the rose.
On Mount Caucasus grows a single wild rose, from the seeds of which have sprung the numerous family of the Provence or Cabbage roses, very double, very large, and very fragrant. This race is remarkable for its tendency to sport, from which have resulted some of the most singular and beautiful forms of the rose. For example, a rose-colored variety of the Provence produced a branch bearing striped flowers, and from that branch has been propagated the Striped Provence. The Crested Moss is the product of another of these freaks, being of the pure Provence race. The Common Moss, and all its progeny, have the same origin; being derived, in all probability, from a sporting branch of one of the Provence roses.
The family of the French-Rose, or Rosa Gallica, is of vast extent, and, though including many diverse shades of color,—some pale, some bright, others spotted, striped, or marbled,—is commonly recognized without much difficulty by its family features. It is a native of Southern Europe.
The wild progenitor of the Damask or Damascus roses is a native of Syria. The name Damask, by the way, is popularly applied to deep-colored roses in general; but its floral signification is very different. In this group, for the first time, we meet with a feature, which, desirable as it is, was not many years since regarded as rare and exceptional. June has always been regarded as the month of the rose; but some of the Damasks have the peculiarity of blooming twice, or more than twice, during the season. These have been placed in a group by themselves, and christened Damask Perpétuais. The remontant character, however, is not confined to them; for individual plants belonging to groups and varieties which usually bloom but once will sometimes display an autumnal bloom. Thus the common wild rose of New England is now and then to be seen covered with flowers in September; and there is little doubt, that, from the seeds of these twice-blooming individuals, a new race of hardy remontant roses might be produced. It should be added, that many of the so-called Damask Perpetuals are not pure Damask, but crossed with the blood of other families.
Of the remaining races of pure blood, the Alba is remarkable for the delicate coloring of its flowers; the greater part being, as the name imports, white, or nearly so. The original variety grows wild in Central Europe.
The Austrian Brier is another family, of features very strongly marked. Yellow and copper are its prevailing colors; and from its habit of growth, and the color of its twigs, it is easily recognized under all its forms. Its original types are natives of the south of Europe, and probably of Persia; to which country we owe its finest development,—the well-known Persian Yellow.
The Double Yellow Rose, Rosa Sulphurea, remarkable for its beauty, and, in our climate, notorious for its intractable and uncertain character, is regarded by some botanists as belonging to a group distinct from the preceding. The Single Yellow, from which it must have sprung, has been found wild in the north of India.