Mr. Woops on the British Species of Rosa. 213 
the calyx-leafits as a decided mark of separation ; for the double 
serratures of the leaflets are sometimes rather ambiguous, and al- 
ways less strongly marked than those of R. Borreri; and the simple 
serratures of R. collina, though I believe never strictly compound, 
are yet frequently so irregular and unequal as to produce some- 
thing of the same appearance. From R.hibernica R.casia is arti- 
ficially distinguished by the total want of the smaller scattered 
aculei. I have neverseen this plant in aliving state; but Mr. Bor- 
rer assures me that the dense mode of growth, glaucous shoots, 
_ and hoary blueish gray foliage, contribute to give it an Le pere vi 
_ Very different from that of any other Rose. 
Rosa rubrifolia of Villars, Dauph. iii. 549, seems late 
between this species and R. nuda. Baron Fr. X. Wulfen, in 
Romer's Archiv. fur die Botanik, mentions a Rosa glaucescens which 
in some respects resembles this ; while i in others it seems to unite 
better with R. collina. 
The Rose with leaflets pubescent on the underside, mentioned 
by Afzelius in his Tent. de Ros. Suec. as confounded in Sweden 
with R. canina, is supposed by Sir J. E. Smith in Engl. Bot. to be- 
long to this plant; it seems to me to be decidedly my R.collina B. 
18. Rosa SARMENTACEA. 
R. stylis distinctis, receptaculis ovatis, aculeis uncinatis, foliolis 
| duplicato-serratis glaberrimis. F5 eee 
R. canina. Roth FT. Germ. i. 218; ii. 560. — es 
Frutex 8—10-pedalis. Rami diffusi, olivacei, saad? aculei adunci, nune > rari, sparsi, 
. nunc solitarii vel binato-stipulares. : : Petioli absque pubescentia, hic illic glandulosi, 
5 du falcatis basi expansis muniti. _ Stipule spatulatæ, glabra, serrate, serra- 
turis interdum glanduliferis; ex floribus propiores etiam solitariis multo latiores, 
tandem foliis deficientibus in bracteas ovatas acuminatas immutate ; ad florum eymas 
bractez illae numerosiores, sed basi angustiores. Foliola 5 vel 7, elliptica, par superius et. 
foliolum impar ceteris majora, subacuminata, glabra, supra cerea, subtus interdum nervo 
aculeata, 
