40 



THE MAGAZINE OF HORTICULTURE. 



all the latter part of the season, from July to October, and its 

 rich ruby corols, neat foliage and dwarfish compact growth 

 render it highly ornamental. Though only recently added 

 to our collections, it appears to be of the easiest cultivation, 

 and quite hardy ; but farther experience is needed to see 



SPIRiEA CALLOSA. 



whether, in very severe cold, it may not lose some of the ter- 

 minal shoots. We have no doubt, however, as it comes from 

 the northern part of China, that it will be as hardy as the S. 

 prunifolia. 



3. SpiRiE^A BiLLARDii. — This is a hybrid production, raised 

 in France by M. Billard, between salicifolia and DouglaszY, 

 both American species. It was introduced the last spring, 

 and flowered abundantly with us all the autumn. In general 

 habit it is similar to salicifolia, but the flowers, which are 

 produced in terminal spikes, are of a bright rose color, more 

 loosely set than Douglas/z, and more compact than salicifolia. 

 It is very erect in its growth, and continues to display its 

 * flowers till late in the season. 



It is the finest hybrid of this tribe which has been raised. 



