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APPENDIX. 



are mixed indiscriminately : unarmed is used to denote smoothness, or the absence of prickles 

 and setse from the same parts. 



Prickles: a, Rosa abyssinica ; b, R. Brunonii; 

 c, R. sericea ; d, R. myriacantha. 



Setse : a, Rosa stricta ; b, R. nitida. 



Prickles or aculei are the sharp rigid processes which occur on most of the species ; in some 

 being straight, and'in others more or less hooked, and also varying much in size. 



Setce are small straight prickles or aculei, tipped with a gland ; known from true glands by 

 their rigidity : they are believed to exist at some period, in all the species, upon the rootshoots, 

 and become soon changed into bristle-like aculei by losing the gland : in general they are de- 

 ciduous. 



Glands : a, Rosa sarmentacea ; b, R. rubella. ' Stipules : a, Rosa sericea; 6, R. Lyellii. 



Glands are secretory bodies, for the most part attached to leaves on their under surface, and 

 better distinguished from setse by their scent than by any thing else. The well-known 

 appearance of the Moss Rose is caused by glands in a peculiar condition. 



Pubescence is applied to a kind of downiness caused by the presence of short fine hairs : when 

 found on the branches, peduncles, or the tube of the calyx, it offers an invariable discriminative 

 character, but the reverse if found on the leaves. 



Stiptdes are little leaf-like appendages growing one on each side of the leaf stalk at its base, 



