34G FLORA HISTORICA. 



flower rarely produces seeds in England, but it is 

 easily increased by parting the roots, and is by 

 far the most desirable kind for ornamenting the 

 shrubbery, since it continues to give out a multi- 

 tude of flowers from the inonth of July to the end 

 of October. This plant is remarkable for not being 

 affected by the smoky atmosphere of London, and 

 is one amongst the small number of plants that will 

 flourish in our overgrown capital. 



The tuberous-rooted Helianthus, or Jerusalem 

 Artichoke, has already been noticed at some length 

 in the first volume of the History of Cultivated 

 Vegetables. America has afforded us eleven other 

 species of the Helianthus, which are seldom culti- 

 vated excepting in botanical gardens. 



