PROPAGATION. 



081 



namely, Rosa simpUcifolia, Rosa lutea, and Rosa ceniifolia ; all others being 

 mere varieties of these, produced by accidental hybridization, as the numerous 

 varieties of the garden have been produced by art. 



1836. *' It may be asked," he says, continuing this argument, "if we admit 

 only three species of rose, how explain the striking analogy which exists 

 between the American roses and those of Asia, between those of Asia 

 •and those of Europe ? The facts explain themselves sufficiently, and 

 -only prove that the like causes produce the like results. The rose, like 

 all organized beings, is subject to variations arising from climate ; and 

 if men always took into consideration this constant rule of Nature, they 

 would be less apt to make species out of mere variety, arising from local 

 circumstances. Again, arriving at the conclusion that there are only three 

 species of rose, I have submitted all the varieties I describe to analysis, 

 and I have found only two properties invariable : — 1. the colours ; pure 

 yellow being opposed to white and red ; 2. the leaves simple, as opposed to 

 composite leaves ; and the only roses offering invariable characters are as 

 follows : — 



I. Rosa simpUcifolia. — Flowers pure yellow, with spines sometimes 

 composite, leaves simple. 

 II. Rosa lutea. — Flowers pure yellow, spines always simple, leaves 

 composite. 

 III. Rosa mutabilis. — Flowers rose-colour, passing through all the 

 shades from white to red and violet ; spines always simple, 

 leaves composite." 



1837. All other roses are only accidents of climate or culture. It is not 

 necessary that we affirm or dispute the views of M. Boitard, there being, pro- 

 bably, a mean between his views and those who would number the species by 

 scores ; it better suits our purpose to group them according to their habit, 

 flowering season, and the requirements of their cultivation. 



1838. It will be obvious from what has been said, that the great obstacle to 

 hybridizing in our climate is the difficulty found in ripening the seeds. Tea- 

 scented and Chinese roses must be grown under glass to do so. Most other 

 varieties ripen their seeds sufficiently out of doors. Among these Mr. Paul 

 gives a list of twenty kinds which ripen their seeds perfectly in this country 

 in ordinary seasons. Thesf> are, — 



Hybrid Ferpetuals, 



Hybrid Chinese, 

 Chenedole. 

 Marshal Soult. 

 Duke of Devonshire. 

 General Allard. 



Hybrid Bourbons. 

 Athelin. 

 GreatWestern. 

 Charles Duval. 



Most. 

 Du Luxembourg. 

 Celina. 



Madame Laffay. 

 Comtesse Ducbatel. 

 William Jesse. 



Austrian Brier, 

 Harrisonii. 



Bourbons. 



Bouquet de Flore. 



Malvina. 



Ceres. 



Bosomene. 

 Gloire de Kosomene, 



French. 

 Eosa Muudi. 



MuUiJIora, 

 Busselliana. 



Ayrshire. 

 Splendeus. 



