INFERTILE HYBRIDS. 207 
No crown is formed, but the main stem gives off branches low down. 
Suckers are not produced. The branches die back a little in winter, 
leaving dead points. Secondary branches are borne from successive 
buds. They about equal each other in size, and may be regarded as of the 
nature of spurs. 
The leaves are pinnate, with usually three leaflets; occasionally there’ 
are five, and sometimes the lowest pair branch and produce each a pinnule 
pointing backwards. The leaflets are broadly ovate, with comparatively 
shallow serrations. A few minute prickles occur on the rachis of many 
of the leaves. 
The flowers (fig. 494) are produced in terminal panicles. They are 
? inch in diameter, the petals very small, irregular in size and number, and 
white. 
Fie. 48.—Fruir or Raspperry x LoGAaN-BERRY—a, witH DrurEets REeMovED; 
b, Entire Fruir. Narurat Size. 
_ Rubus rosefolius, better known in gardens as R. sorbifolius (the so- 
called strawberry-raspberry), differs in every way from the above. It 
spreads greatly by means of suckers, and crowns or tufts are formed here 
and there. The aérial shoots are annual, and attain at most the height of 
18 inches, 
The leaves are pinnate, five being the usual number of leaflets ; often 
there are seven. In form they are narrow, oblong-elliptical, with deep 
serrations, and a rugose surface. Many sharp, curved prickles are present 
on the rachis and the midribs of the leaflets. 
The flowers (fig. 49 B) are borne singly or a few together in a very 
loose leafy panicle. They are very large, the largest 2 inches in diameter. 
The petals are broad, firm, white and symmetrical. 
The hybrid between Ff. occidentalis and. R. rosefolius is a very 
marked one. It is now six years old. Its height is 4 ft. 6 in. It is fairly 
