234 PKOPAGATIOIT OF PLANTS. 



tanus), and Field Maple {A. campestre), have a stronger 

 affinity for their own species than for others. The Japan 

 Maples, and there are numerous varieties, succeed only 

 when worked on stocks of closely allied species. No 

 American or European species has as yet been tried that 

 makes even a passably good stock for these Maples, but 

 as seedlings of the indigeneous species of Japan can now 

 be imported quite safely and cheaply, propagators are not 

 seriously iDcommoded by the failure of other species to 

 furnish a good stock. 



^scuLus (Horsschestnut). — ^Varieties of the European 

 Horsechestnut {^. Hippocastanum), should be grafted 

 upon seedlings of the species. Our indigeneous varieties 

 and species, some of which are mere shrubs, may be 

 grafted upon seedlings of the Buckeye (^. glabra), the 

 largest growing native species of the genus. 



Alkus (Alder). — The Heart-shaped Leaved Alder 

 {A. cordifolia), makes an excellent stock for trees to be 

 planted in a dry soil, while the Sticky Alder {A. glu- 

 tinosa), is the best for moderately dry soils. These are 

 both natives of Europe, but it is quite probable that some 

 of our North American species will yet prove equally as 

 valuable for stocks, especially those which grow to a large 

 size, like the Eed Alder {A. rubra), of, the northwest, 

 and the Oblong-leaved Alder {A. oUongifolia), of New 

 Mexico and the regions westward. 



AuEATTCABiA. — See Ooniferse. 



Aebob Vitjb. — See Coniferse. 



Akbittus (Strawberry Tree). — The common European 

 species {A. Unedo) is usually employed as a stock for the 

 various species and varieties of the genus. 



Azalea. — For all the various species and varieties of 

 the deciduous Azaleas the two North American species, 

 known as A. viscosa and A. nudiflora, have proved to be 

 superior, if not the very best, stocks known. They are ex- 



