Mr. Woops on the British Species of Rosa. 168 
aculei of the petioles. Sete are found on the same parts as the 
aculei, and are besides frequent on the peduncle and fruit, and 
sometimes on the leafits of the calyx: they differ, in being longer 
or shorter in proportion to the size of the gland " which they are 
terminated. 
The Guanps of Roses are almost songé on dittle footstalks, 
which however being weak, and seldom of length greater than 
the diameter of the gland, may in general be Pabcsditd separated 
from the sete above mentioned. 
Glands rarely occur on the stems ;- but they are found on the 
stipulæ, which are frequently fringed with them ; on the petioles 
and nerves; in some Roses on the under, and in some also on the 
upper side of the leaf, and sometimes on the edges, tipping the 
serratures, or giving the appearance of secondary ones; on the 
fruitstalk, receptacle, and calyx. The latter part is not unfre- 
quently furnished with set: at the base, which, gradually dimi- 
nishing in length and strength, pass insensibly into glands to-- 
wards the termination of the phyllus. To these glands the odour 
of the leaves of Roses seems to be invariably owing.: They are 
generally most abundant on the early and imperfectly-formed 
leaflets, and sometimes fall off or dry up towards autumn. . 
Some Roses are furnished with only one sort of these arms, others 
have two, others again all three. In some, one sort is confined to 
one or two parts of the plant, as the sete of R. villosa; in others 
it occurs generally, as the sete of R. rubella. Some species, as 
Rosa Eglanteria, proceed by almost insensible gradations in one 
part or other of the plant from hooked to straight prickles, to 
sete, and to glands; others again, though furnished with all these, 
display them perfectly. distinct. In some the aculei, though 
always distinct from setze, vary very much in size and character; 
¥ 2 in 
