THE NURSERY-LIST 411 



but it is not hardy enough for the North, unless worked low and 

 planted deep. See also Azalea. 



Rhodotypos. Rosacece. 



Propagated by seeds, by greenwood cuttings under glass in early 

 summer, and by hardwood cuttings. 



Rhubarb : Rheum. 



Rhus (Sumac). Anacardiaceas. 



Propagated by seeds sown in fall or stratified, layers, suckers, 

 root-cuttings and cuttings of green or ripe wood. Suckers are 

 generally used. 



Rhynchospermum : Trachelospermum. 



Ribes (Currant. Gooseberry). Saxifragacece. 



Propagated by seeds, which should be sown as soon as ripe, or else 

 stratified for new varieties ; also by hardwood cuttings in fall and 

 by greenwood cuttings in summer under glass. Mound-layering in 

 summer is sometimes practiced. Budding or grafting is employed for 

 quick propagation of rare varieties, the common available stocks 

 being used. See Currant and Gooseberry. 



Richardia : Zantedeschia. 



Ricinus (Castor Bean). Euphorbiaceoe. 



Propagated by seeds, which in the North are started indoors in 

 early spring. 



Rivina. Phytolaccacece. 



Propagated readily by seeds, which are produced freely ; also by 

 cuttings in spring in heat. 



Robinia (Locust. Rose Acacia). Leguminosce. 



Increased by seeds, sown in fall or spring, and which usually 

 germinate better if soaked in hot water previous to sowing. Also 

 grown from layers, suckers and root-cuttings. Named varieties are 

 grafted or budded, the common locust stock (R. Pseudacacia) being 

 preferred, even for the rose acacia (R. hispida). Dwarf forms are 

 propagated by division and other varieties by cuttings of mature 

 wood in fall. 



Rocambole (Allium Scorodoprasum). Liliacece. 



Propagated by " cloves," which are divisions of the bulb. 



