Dec, 1910.| BOTANICAL SOCIETY OF EDINBURGH 135 
(10) Magocay-Direrz.—Bot. Centralblatt, xliii., 1891, p. 393, 
(11) Penzia and CHaBRERA.—Malpighia, anno xvii., 1903. 
(12) Guerrn.—B. 8. Botan. de la France, tom. liii., 1906. 
(13) Dretrrno.—B. S. Bot. Ital., x., 1901. 
(14) RoccuErr1.—Contrib. Biol. Veg., iv., 1905, 
(15) AuRivittius.—Acta Nova Upsal., ser. 3, xi1., 1886-87. 
(16) Banxs.—Proc. U.S. Nat. Mus., xxviil., 1905. 
(17) ArrKen.—Trans. R.S. Edin., xxxvii., pt. 3, 1894. 
(18) Frinxk.—Bot. Gazette, xxxviil, 1904. 
(19) Ganrorri and Levi.—Arch. Ital. de Biol., tom. 1iii., 1909. 
(20) Prerrer.—Pflanz. Physiologie, Leipzig, 1897. 
(21) Kny.—Ber. d.d. Bot. Ges,, Bd. iv., 1886. 
On Some British Hyprip Rossts. By J. R. MATTHEWS. 
(Plate XIT.) 
Although within recent years considerable attention has 
been given to the genus Rosa, much still remains to be done 
in way of systematic classification. This is perhaps more 
true of the section of Pimpinellifolie hybrids than of any 
other section of the genus. The difficulty obviously arises 
from the hybrid origin of these roses ; and until their exact 
parentage is known, it seems to me impossible to expect a 
satisfactory classification of the individual species which go 
to form the three groups of the section. Especially is this 
true of the group Pimpinellifoliz x Villosz, where too much 
stress has been laid on technical characters, such as size and 
serration of leaflets, glandularity, hairiness, ete., and little 
or no reference has been made to the characters of the 
possible parents. 
The position of the sepals appears to be a very important 
consideration, but the determination of this point is fre- 
quently rendered difficult owing to the fact that in most of 
these hybrids the fruit aborts before the real position of 
the sepals can be ascertained. But if this matter could be 
determined from observation of the living plants (her- 
barium specimens are not always to be depended upon), a 
great advance would be made in determining the second 
parent, and, as a consequence, the classification of the 
species would be rendered easier and, at the same time, 
more natural. 
It is not my intention to give a detailed description of all 
the hybrid roses that have been found in Britain. That 
