184 Mr. Woo»s on the British Species of Rosa. 
Jatiores, et etiam in bracteas parvulas immutate. Foliola 9; par superius et fo: 
liolum impar ceteris majora, omnia elliptica, duplicato-serrata, subtus venulis hir- 
suta, supra glabra, nisi interdum nervo quandoque petioli instar pilis sparsis, glandulosa. 
Pedunculi solitarii, rarius binati, setis inzequalibus obsiti. Receptaculum globosum, 
atro-fuscum, setis ut pedunculus munitum. | Calycis foliola triangulari-lanceolata, in- 
tegerrima, petala plerumque zequantia, glandulosa, receptaculo pallidiora. Flores 
cyathiformes ; petala obcordata, rubescentia, basi albida. Styli inclusi; stigmatibus 
planiusculis, Fructus globosus, setosus : maturi colorem nescio. 
Scotland, principally on the western coast. Glen Lyon, Rev. 
J.Stuart, D.D. Isle of Arran, Mr. G. Don. 
This Rose is easily distinguished from R. rubella and R. spino- 
sissima, by the double serratures of the leaflets. From R. Doniana 
it is known with more difficulty ; for though I have uniformly 
found the upper surface of the leaf without hairs in this species, 
with the exception already noticed in the description, and as uni- 
formly pubescent in the other, yet I feel that it would be un- 
wise to place an entire dependence on this character. Still, how- 
ever, the expanded flower and comparatively scattered prickles 
of R. Doniana seem to denote an essential difference between 
the two plants. The root-shoots of R. Doniana are indeed very 
full of aculei, though less so than those of R. involuta ; and it 
must carefully be observed as a general rule in the comparison of 
these and of all other species of Rosa, that we must draw the pa- 
rallel between similar parts :—for instance, in the present case we 
must compare the strong surculi or root-shoots of R. involuta with 
the surculi of R. Doniana, and the branches of the one with the 
branches of the other; and not conclude that there is no diffe. 
rence if the surculi of R. Doniana are as thorny as the weaker 
branches of ft. involuta ; for in almost all Roses these strong shoots 
are decidedly more prickly than the rest of the plant. 
If the distinctive character between this famil y of Roses and that 
of R. cinnamomea be drawn from the bracteæ, as I conceive must 
necessarily be the case, the young botanist may possibly be led 
by 
