ROSACE/E 



351 



mountain bramble). They are usually designated as 

 "brambles." The stems are, as a rule, prickly, erect, decum- 

 bent, or creeping. The stems ("canes") commonly die after 

 one or two years, new ones being sent up from the roots. The 

 main growth of the stem is made during the first year, in 



Fig. 148. — Fruiting branch of American red raspberry (Rubus strigosus). 



most Rubi; side branches are produced the second year; the 

 flowers and fruit are developed on these side branches. The 

 entire cane usually becomes weak and dies after fruiting. 

 This suggests the advisabiUty of removing canes once they 

 have borne fruit. 



Propagation.^Red rasi)berrics, blackberries and dew- 

 berries (rarely) "sucker" readily. This natural tendency to 



