282 42. R. TUBERCULATUS. 



Nees, ''pedunculi et calyces aculeis glandulis pilisque valde 

 horrentes;" and a similar description is given by them of the 

 barren stem. The armature of the stem of our plant is 

 totally different; the short hairs and setse, although toler- 

 ably abundant, being inconspicuous. On the flowering shoot 

 the petioles are distantly furnished with prickles and have 

 few aciculi or setae ; the upper part of the rachis, and of the 

 peduncles, bears an abundance of long straight or slightly 

 deflexed slender prickles which much exceed in length the 

 few aciculi and (often) rather plentiful but unequal setse: 

 but the number of the setje is very variable, even upon the 

 same bush. The sepals also are much less strongly armed 

 than those of li. ferox (Weihe). It should be added that I 

 have derived all my knowledge of the R. ferox from the 

 imperfect specimen contained in the Herbarium Normale of 

 Fries (ix. 50), the plate in the Ruhi Germanici, and the 

 description in Arrhenius's Monograph. I believe it is refer- 

 able to E. diversifolius (Lindl.). 



Plants belonging apparently to this species are tolerably 

 abundant in the county of Cambridge. They have more 

 interlacing hairs on the barren stem than are found on 

 Leighton's specimens. The stipules of the barren stem are 

 variable in form being sometimes lanceolate and at others 

 very narrow. 



M. Questier has sent this plant as R. dumetoriim var. 



ferox. I have already endeavoured to show that it cannot 



bear that name. It is clearly not the R. ferox of Boreau, 



nor do I find any description which will suit it in that 



author's elaborate account of the Rubi of central France. 



It may be useful to add how all the forms of the sup- 

 posed English R. nemorosus (Man. ed. 4. 107) are disposed 

 of — a = R. corylifolius a; P^R. corylifolius y; y^R. coryli- 

 folius P; B- R. tuberculaius. 



Habitat. — Hedges. July, August. 



